Biology Leap 2025 Review

Over time, the number of Amazon River dolphin deaths has decreased. Which prediction best describes what will happen first as a result of a decreased death rate?

• The population will decrease because all the dolphins will starve.

• The population will stay the same size because the dolphins will live longer.

• The population will increase because more dolphins will survive and reproduce.

• The population will decrease for a while and then increase so that the population size is balanced.

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The diagram shows two parent horses and their foal. Which statements identify traits the foal most likely inherited from its parents? Select the two correct answers.

• gray hair from its mother

• a white tail from its mother

• a solid hair color from both parents

• a spotted hair pattern from its father

• white hair on its face from both parents

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People need vitamin D to help their bones get enough calcium so that the bones can be strong. People can get vitamin D from milk, fish, and mushrooms. People’s bodies can also make vitamin D when their skin absorbs light from the Sun. Which situation will most likely cause a person’s bones to become weak?

• The person spends a lot of time outside.

• The person avoids foods with vitamin D.

• The person eats cereal with milk for breakfast each morning.

• The person eats lots of fish that provide vitamin D.

Black carp are fish that were brought to the United States in the 1970s. Some black carp escaped into rivers during floods. They began to eat mussels and snails. The way mussels and snails feed helps clean the water in a river.

Which effects will most likely be caused by introducing black carp into new ecosystems?

Select the two correct answers.

• Other types of fish will find new food sources.

• Some types of snails will disappear from the ecosystems.

• The water in rivers will become dirty as black carp eat more mussels.

• Plants that live in rivers will be healthier because fewer nutrients will be in the water.

• The number of large predators will increase because they will have more kinds of fish to eat.

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The life cycle of humans is similar to the life cycle of dolphins.

Based on their life cycles, how are Amazon River dolphins and humans alike?

• Both change shape as they grow.

• Both are born and then grow larger.

• Both develop bodies that help them swim.

• Both live in groups for protection from predators.

What is the definition of population?

• The place where many animals live

• To blend in with sourroundings

• All the same organisms in the same place and the same time

• To pretend to be something or someone else

What is the definition of habitat?

• A place that an organism naturally lives in

• Something an organism eats

• To break down

• A special feature that an organism has to survive.

Which of the following best describes the role of chlorophyll in photosynthesis?

• A) It absorbs light energy to convert carbon dioxide and water into glucose.

• B) It provides structural support to the plant cells.

• C) It transports water and nutrients from the roots to the leaves.

• D) It stores the energy produced during photosynthesis.

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What is the primary function of the mitochondria in eukaryotic cells?

• A) To synthesize proteins

• B) To produce ATP through cellular respiration

• C) To store genetic information

• D) To facilitate cell division

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In a controlled experiment, what is the purpose of the control group?

• A) To provide a standard for comparison with the experimental group

• B) To ensure that the experiment is conducted safely

• C) To increase the sample size of the experiment

• D) To eliminate the need for repeated trials