A diagram representing the levels of organization within an organism is shown. Which level of organization is identified by X?

The diagram shows models of the circulatory systems of a fish and frog. A student compared these diagrams. The student found that each of these organisms had a heart to pump blood. Which statement is supported by the student's findings?

The diagram represents the life cycle of a butterfly. This life cycle represents the process of

Water and carbon dioxide are waste products released as a direct result of

The primary function of a plant's roots is to

Genes are a part of a

Compared to the amount of genetic information contained in a normal human body cell, the amount contained in a normal human sperm cell is

The diagram represents a pedigree chart. Which type of information is organized by this chart?

A change in an animal's DNA, leading to a variation in a species, is called

Which set of terms describes natural fertilization and development in humans before birth?

A plan growing toward a light source is an example of an organism

A cactus plant, a snake and a hawk can be members of the same

In 1865, a pond was surrounded by open fields. Today, the same area is swampy and surrounded by a forest. Which process is responsible for this change?

Which substance in green plants needs to absorb sunlight during photosynthesis?

The food label lists nutritional facts about a serving of cereal alone and cereal with a 1/2 cup of fat-free milk. How much total energy is contained in a single serving of this cereal with a 1/2 cup of fat-free milk?

The food label lists nutritional facts about a serving of cereal alone and cereal with a 1/2 cup of fat-free milk. One nutrient that is obtained when milk is added to the cereal is

The fur on an arctic polar bear appears white all year. The color of the fur is an example of

Urban growth and uncontrolled waste disposal by humans most likely results in

Cell division occurs as part of which process?

This sign was posted near a lake. Which environmental problem is most likely indicated by the sign?

Which human activity would help reduce the amount of carbon dioxide in the atmosphere?

The data table shows data for four planets in our solar system. For which planet is the length of the planet's day longer than the planet's year?

Which weather instrument is used to measure wind speed?

The diagram represents the Moon at positions A, B, C, and D in its orbit around Earth. Which graph best represents the percentage of the lighted side of the Moon that can be seen by an observer in the northern hemisphere when the Moon is at the positions shown?

The diagram represents the Moon at positions A, B, C, and D in its orbit around Earth. Approximately how long does it take for an observer on Earth to view a complete cycle of Moon phases?

The motions of comets and asteroids in our solar system are predictable because they are

Which two gases, when released into the atmosphere, are believed to contribute most to global warming?

The diagram represents a flashlight that has been turned on. Which form of energy is being converted to electrical energy by the batteries in the flashlight?

Which set of Earth components is arranged in order from solid to liquid to gas?

The graph shows the change in ozone concentration with altitude in Earth's atmosphere. The data table below shows the average height range above sea level, in kilometers (km), for the different layers of Earth's atmosphere. Which layer of Earth's atmosphere contains the highest concentration of ozone?

The cross section represents a plunge pool that formed at the bottom of a waterfall. The plunge pool at the bottom of the waterfall was formed mainly by

What is the main source of energy for the water cycle?

The diagram represents a Lystrosaurus. Lystrosaurus was an herbivore that lived on land about 250 million years ago. Fossils of the dinosaur have been discovered on the widely separated continents of African and South America. Which statement best explains why Lystrosaurus fossils are found on these two continents?

A student correctly determined the density of two rocks. If the volumes of the two rocks are equal, the rock with the greater density has a

Which terms best describe the properties of a gas?

Low-pressure systems generally move across the United States from

The block diagram represents a displaced rock structure. Which process was responsible for the displacement of the horizontal rock layers?

Which event is an example of a physical change?

The diagram represents a portion of the Periodic Table of Elements. Based on its position in the Periodic Table, at room temperature, cadmium is most likely a

The model represents a molecule of ammonia gas. Ammonia gas would be classified as

The chart shows the wind-chill temperatures caused by wind speeds at different surface air temperatures. What is the wind-chill temperature when the surface temperature is 10^oF and the wind speed is 20 mph?

The diagram represents a person using a wheelbarrow to move a heavy load of soil. Which two simple machines are parts of the wheelbarrow?

The diagram represents the rock cycle. According to this diagram, metamorphic rock is formed by