What is the smallest structural and functional unit of life?

Similar microscopic living units work together to contract a muscle. Which level does this group represent?

The stomach contains several kinds of living material that work together in digestion. At which level does the stomach belong?

The heart and blood vessels work together to transport blood throughout the body. Which level does this combination represent?

During an outdoor activity, Lian observes one maya bird feeding and moving. Which level does this individual represent?

All the tilapia of one species living in a particular pond belong to which level?

Frogs, dragonflies, reeds, and other living things interact around a lake. Taken together, which level do these living groups form?

A coral reef study includes fish, corals, sunlight, seawater, and their interactions. Which level includes everything being studied?

Which term describes a large geographic region characterized by its climate and typical plant and animal life?

Which level includes all regions of Earth where life exists?

Which field studies how living things interact with one another and with their surroundings?

Look at the pond scene. Which visible feature is a nonliving environmental factor?

What term means the natural home or environment of a living thing?

Which label replaces the question mark in this diagram?

Heart muscle is damaged and pumps less blood. Which effect on other body parts is most likely?

Which pair contains one living factor and one nonliving factor that can affect a pond fish?

Which living thing occupies the first feeding level in this diagram?

Which process helps explain why less energy is available to large fish than to small fish in this diagram?

A frog eats an insect that fed on a green plant. What role does the frog have in this feeding relationship?

What makes green plants producers in a food chain?