A group of organs working together to perform a certain function is called

Which structure’s main function is to produce food (sugar) in a plant?

Which two human body systems work together to perform locomotion?

An organism that contains chloroplasts is able to produce food by the process of

Competition within a pack of wolves may increase if there is an increase in the

Which sequence lists the hereditary material found inside cells from the smallest unit to the largest unit?

A fox with thick fur would have a survival advantage over other foxes if

Infants will often smile when they hear a parent’s voice. In this situation, the parent’s voice is considered

Which fertilization and development method is most typical of humans before birth occurs?

What is the main factor that prevents the growth of tropical plants in the northern part of the United States?

The diagram below represents a cross section of four sedimentary rock layers containing fossil remains. The layers have not been overturned. Which type of fossil is found in the most recently formed sedimentary rock layer?

The diagram below represents the changes in the body structure of a frog as it goes through its life cycle. The changes shown are best described as

The diagram below represents changes in the main types of plant species found in a specific area over a 15-year period. Which process is represented in the diagram?

The diagram below represents a plant. One plant structure is labeled X. The main function of structure X is to

The data table below shows the number of Calories provided by one serving of four food items. One serving of which food item on the data table provides the most energy?

A puggle is a type of dog first produced by mating two other types of dog, a pug and a beagle. This process is an example of

The information below describes a relationship between a type of fish known as a goby and a species of blind shrimp.

The shrimp digs a hole that provides shelter for itself and the goby fish. The goby fish lives at the opening to the hole and watches for predators. When a predator swims by, both organisms quickly move farther into the hole for safety.

The relationship between these two organisms is best described as

Which activity involves only a physical change?

Compared to the volume of Earth, the volume of the Sun is approximately

Gravity is the primary force responsible for

The diagram below represents the effects of certain types of pollutants on the atmosphere. The best title for the diagram is

The diagram below represents Earth at one position in its rotation. Points A, B, C, and D represent locations on the surface of Earth. Which location will enter darkness next as Earth’s rotation continues?

Base your answer on the diagram below and on your knowledge of science. The diagram represents Earth’s crust and interior layers. Which evidence has led scientists to conclude that there are different layers within Earth’s interior?

Base your answer on the diagram below and on your knowledge of science. The diagram represents Earth’s crust and interior layers. Which Earth layer contains convection currents that are believed to be responsible for the movement of Earth’s tectonic plates?

The relatively thin layer of rock at Earth’s surface is called the

The circle on the map below represents the area where an air mass formed over Canada. Which characteristics best describe this air mass?

The diagram below illustrates the rock cycle in Earth’s crust. According to the diagram, what will form when sedimentary rock is exposed to heat and/or pressure?

The diagram below represents a cross section of sedimentary rock layers in Earth’s crust. Line XY represents a fault. Which statement best describes the geologic history of this section of Earth’s crust?

The diagram below represents a rock that was placed in a graduated cylinder containing 20 mL of water, causing the water level to rise. Which physical property of the rock is being measured using the graduated cylinder?

As water is heated, the motion of the water molecules will generally

Base your answer on the model of a water molecule below and on your knowledge of science. What does this model represent?

Base your answer on the model of a water molecule below and on your knowledge of science. Hydrogen and oxygen are classified as

Which form of energy is almost always produced during energy transformations?

Which energy source is nonrenewable?

A student added some sugar to a glass of water, but it did not dissolve quickly. What could the student do to increase the rate at which the sugar dissolves in the water?

The diagram below represents a weightlifter holding a barbell above his head. The force of gravity pulling down on the barbell is 756 newtons (N). How many newtons of force are exerted by the weightlifter to hold the barbell up?

The diagram below represents a person using a lever. The person applies force to the lever to change the rock’s

Which measurement can be used to determine if a specific place is located north or south of the equator?

Base your answer on the diagram and graph below and on your knowledge of science. The diagram represents a laboratory setup used to study heat transfer. Two covered, insulated cups, A and B, are connected with an aluminum bar. Each cup contains the same amount of water, but the water has different starting temperatures. The water in cup A had a starting temperature of 100°C. The water in cup B had a starting temperature of 20°C. The graph shows the changes in the water temperatures over a 20-minute period. If the temperature of the water in cup A continues to decrease as shown on the graph, what will the approximate temperature of the water in cup A be at the end of 25 minutes?

Base your answer on the diagram and graph below and on your knowledge of science. The diagram represents a laboratory setup used to study heat transfer. Two covered, insulated cups, A and B, are connected with an aluminum bar. Each cup contains the same amount of water, but the water has different starting temperatures. The water in cup A had a starting temperature of 100°C. The water in cup B had a starting temperature of 20°C. The graph shows the changes in the water temperatures over a 20-minute period. I If the aluminum bar were shorter, the cool water in cup B would increase in temperature at a faster rate because

The diagram below represents a metal spoon in a glass of water. The spoon’s broken appearance is caused by light that is

An experiment is described below.

A large field at the base of a mountain becomes flooded when heavy rains in the mountains cause a stream to overflow. Each time the flooding occurs, more soil washes away. The owners of the land want to perform an experiment to see if different types of plants could help reduce the soil erosion. They choose five areas of ground that are the same size, the same distance from the stream, have the same slope and the same kind of soil, and receive the same amount of sunlight. The type of plant planted in each area is different for each of the five areas. Measurements of soil erosion will be made each time flooding occurs. The results will be compared after six months.

Which hypothesis is being tested in this experiment?

The data table below shows the yield of vegetables in a school’s garden for 3 years. The yield is the number of pounds of vegetables harvested. The same number of plants was planted each year for all five vegetables.

What is the most likely reason for the decrease in the vegetable yield in 2006?

The data table below lists Earth’s major water resources and some examples of where they are found. Which list correctly identifies A, B, and C in the graph?