Biology

There are 60 - 90 ______ cells in an adult human body.

• million
• billion
• trillion
• thousands

What is composed of several food chains in an ecosystem that intersect and depend on one another?

• niche

• feeding level

• energy pyramid

• food web

Which situation is a biotic factor operating within an ecosystem?

• the kind of climate in a given region

• carnivores that eat other animals

• the concentration of hydrogen gas in the air

• the rate of water flow in a body of water

Characters are controlled by......

• Genes

• Chromosomes

• DNA

• All the above

Communities of living things interacting with non-living things.

• ecosystem
• community
• sphere
• population

The smallest unit of life.

• organelle
• molecule
• tissue
• cell

Another name for Earth.

• ecosystem
• population
• community
• biosphere

Food flows along a food chain from consumers to producers to decomposers.

• true

• false

Variations

• Combination of new characters

• New Characters

• Combination of new characters Of offspring

• All the above

Decomposer organisms break down dead organisms, providing energy to carnivores

• true

• false