The Rio Grande Delta, found where the mouth of the Rio Grande River meets the Gulf of Mexico, is the direct result of--

A simple food web for a marine ecosystem is pictured. How many producers are found in the food web shown?

The three wells shown provide water for a growing city. What is the most likely effect on the systems if six new wells are brought into production as the population increases?

The diagram represents a chloroplast in a plant cell. Which of the following energy transformations occurs in the chloroplast during photosynthesis?

According to the cell theory--

The diagram depicts the biological levels of organization. Which of the following correctly corresponds with the diagram?

A cell is depicted in the figure. Which of the following structures is responsible for storing the cell's genetic information?

Which of the following statements is incorrect regarding an organism's genetic material?

Binary fission is a type of reproduction which occurs in bacterial cells which is illustrated above. What type of reproduction is this an example of?

Rene and Jesse are mixing different solutions together during science lab. They record their findings in their lab notebook as shown in the data table below.

Which of the following mixed solutions resulted in a chemical change?

The hypothalamus in the brain is responsible for the body's thermoregulation. It causes muscles below the skin to contract which gives the appearance of goosebumps and acts as a way to warm up the body in cold environments. This ability of an organism to maintain a stable internal environment is called--

Which of the following is the primary function of the endocrine system?

What do phototropism and geotropism enable plants to do?

A farmer is breeding hens. Blue coloration is dominant (B) to white coloration (b). He mates two heterozygous blue hens. What percent of the offspring will have the recessive phenotype?

When the human body detects a bacterial or viral disease in the blood, the body automatically increase the body temperature to try and kill the disease causing agent which we know as a fever. This response is caused by--

Which biome contains large populations of grazing herbivores, few species of birds, and deep, rich soil?

Damon knows that plants are the base for most food chains. He made a list of plant characteristics shown in the chart.

Which characteristic from the chart enables these plants to capture the sunlight needed to be a producer?

A botanist observes that many plant cells capture the sun's energy and convert it into food energy. A zoologist observes that animal cells get their energy from carbohydrates and lipids contained in food. Which principle of cell theory is supported by the two scientists' observations?

The process of ecological succession is illustrated. Which of the following events would begin primary succession in an ecosystem?

Which of the following characteristics is NOT a determining factor which allows life to exist on a planet?

Which of the following statements is INCORRECT regarding the picture?

The figure represents how plant cells are affected as water moves in and out of the cell. Which of the following statements is correct regarding Cell A and Cell B?

The passage of genetic instructions from one generation to the next is known as --

Palo Duro Canyon State Park is located in the Texas Panhandle near the city of Amarillo. What most likely caused this structure known as "The Lighthouse" in Palo Duro Canyon State Park to form?

Which organ system protects organs, allows for movement, provides structure, manufactures red blood cells, and stores minerals?

The skin is the first line of defense for the human body because it creates a barrier from the external environment. Which cell organelle has a similar function to the skin?

Which producers will most likely be the first species that grow in an area after a forest fire occurs?

According to the nitrogen cycle diagram, what trophic level do the bacteria and fungi, marked by the central box with the question mark, belong to?

Which of the following may cause an extinction of a species?

Four legs from four different birds are illustrated.

Which bird would be best adapted to live near an aquatic habitat such as a pond or river?

The snowshoe hare, artic fox, and snowy owl all have similar adaptations. They are white to camouflage themselves and their fur or feathers are thick to help protect them from the cold. Which biome would these animals be best adapted to live in?

According to the marine energy pyramid, which group of organisms contains the most energy available?

The light colored form of the peppered moth, known as typica, was the predominant form in England prior to the beginning of the Industrial Revolution. Shown below on the right, the typica moth's speckled wings are easy to spot against a dark background, but would be difficult to pick out against the light colored bark of many trees common in England. Around the middle of the 19th century, however, a new darker moth was seen more often. This dark colored form, known as carbonaria, is easiest to see against a light background. After the Industrial Revolution, the increase in carbonaria moths was so dramatic that many naturalists made the immediate suggestion that it had to be the result of the effects of industrial activity on the local landscape. This change in the populations of the light and dark colored moths in England is a classic example of --

Juan and Jessie are studying for a test. They listed all the cell structures they remembered learning in science class.

How many structures listed are found in BOTH plant and animal cells?

Use the white wildflower dichotomous key above to determine the scientific name of this flower.

It is cold outside, and you forget to wear your jacket. How does your body attempt to maintain its normal temperature of 98.6^oF?

Galeocerdo cuvier is the scientific name of the tiger shark. These sharks will eat practically anything. This helps control populations of sea turtles who may cause overgrazing of the sea grass in Western Australia. Since sea grass is where fish lay their eggs, overgrazing would lead to fewer fish. Since tiger sharks play an important role in controlling the ecosystem within their habitat they are considered a _____________ species.

A watershed collects water that has moved from a higher elevation to a lower elevation. The runoff collected in the watershed contained industrial waste and the water soaked into the ground. What will the condition of the groundwater be?

An entomologist is a scientist who studies insects. Entomologists have many important jobs, such as the study of the classification, life cycle, distribution, physiology, behavior, ecology and population dynamics of insects. One entomologist studied the population of insects in different regions (labeled A, B, C, and D) of the Saharan desert.

Which of the following statements is NOT correct regarding the biodiversity in this desert?

The human body is divided into many different organs such as the kidneys, the stomach, and the lungs. Which level of organization would be similar in plants?

Birds have specialized internal structures compared to other animals. When looking at their bone structure compared to other animals, they have longer, hollow bones that are full of air sacs. The picture shows the difference in structure between a human and an eagle forearm bone.

Which statement best supports the reason for the difference in the bone structure between these two groups of animals?

Which cellular process involves converting water and carbon dioxide into oxygen and glucose sugar using radiant energy from the sun?

Camilla is playing outside with her little sister after school one day. Her sister accidentally knocks down one of her mother's potted tomato pants. She goes inside forgetting to place it upright. One week later, she returns outside and notices the plant growth.

This response is most likely caused by which external environmental factor?

Food provides energy our body needs which gets converted to ATP energy. The muscles in the body need ATP energy which provides the energy needed to enable movement.

What energy transformation occurs that enables muscles to move?

Students are learning the difference between a physical and chemical change in matter during their science lecture. As an exit ticket, students must correctly identify which of the following examples are physical and chemical changes. The teacher places the data table on the board.

Which column(s) represent examples of physical changes?

In July, a domestic cat's fur is soft and short. Over a year, the cat's fur first becomes longer and thicker, then returns to being soft and short. This pattern repeats throughout the cat's life. This change to the cat's fur is most likely caused by--

Which of the following is NOT a reason why astronauts aboard the international space station must wear a spacesuit when outside the spacecraft?

Xylem and phloem are important parts of the vascular transport system in plants. When looking at a cross section of root, the diameter of the xylem cells are much larger compared to other sections of the plant. A microscopic photo of the xylem cells are depicted in the graphic.

Which statement best explains the larger diameter of the xylem cells in plant roots?

Use the labeled dorsal view of a sea turtle and the dichotomous key to answer the following question.

Which species of sea turtle is depicted at the bottom of the picture?