While hiking, a student finds an unusual plant-like organism that appears to lack chlorophyll. When the student examines a sample, he sees many cells with cell walls and no chloroplasts. This organism is most likely a member of what Kingdom?

Lightning from a thunderstorm strikes a 21 tree that falls to the forest floor and dies. During the next few years the dead tree undergoes many changes. What organisms are most likely responsible for the biological and chemical changes to the tree?

The population of which of the following 26 organisms would most likely decline if small animals like rats, rabbits, and snakes were eliminated from an ecosystem?

Which cellular organelle uses oxygen and glucose to provide energy to the cell?

The terms gas exchange, diaphragm, and inhale are most closely associated with which system in the human body?

What are the basic structural units of living organisms?

Students are studying the process of photosynthesis in plants. Which of the following is a product of photosynthesis?

What do a caterpillar, mold and fern have in common?

Spirogyra are green algae that can reproduce sexually. Which of the following features identifi es reproduction in Spirogyra as sexual reproduction?

Which of the following groups of organisms uses sunlight to convert carbon dioxide and water into sugar and oxygen?

Which of the following best describes a role of mushrooms in ecosystems?

In the human body, which system functions primarily to defend the body against disease?

Lichens are symbiotic organisms made of green algae and fungi. What do the green algae supply to the fungi in this symbiotic relationship?

If a new organism were discovered, which of the following would most likely be used to classify it into the appropriate kingdom?

Which of the following structures is not present in animal cells?

Which of the following best describes the purpose of the chromosomes in the nucleus of a cell?

The complete removal of decomposers from an ecosystem will have the greatest effect on which of the following?

How is a skin cell from a mouse similar to an amoeba?

Which of the following materials are direct products of photosynthesis?

Muscle cells need to quickly convert energy from food molecules into a usable form. For this reason, which of the following do muscle cells have in greater numbers than most other types of cells?

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