As life began to populate earth's surface, what change was seen in the atmosphere?

A. more oxygen was consumed

B. more carbon dioxide was added

C. more carbon dioxide was consumed

D. more oxygen was added

What are the three ecosystems in the ocean, in order, from nearest to the shore to farthest from the shore? A. neritic, intertidal, pond B. open-ocean, intertidal, neritic C. intertidal, neritic, open-ocean D. open-ocean, intertidal, neritic

You ate a salad for dinner. Which carbohydrate did you eat?

The life function of transport in an organism directly involves those activities used to

The diagram shows a numbers pyramid for a forest community. Imagine that there is only one producer, a tree. This seems to contradict the concept of the typical food pyramid. All but one statement explains how this model is also correct.

Explain how living organisms changed the environment during earth's early years

Black hair is dominant to red hair two black cocker spaniels have 12 puppies 9 black and 3 red what is the genotype of each parent

Which action may have caused botulism? A. Defrosting the chicken on the counter. B. Using the same cutting board for chicken and lettuce without washing it. C. Consuming tuna from a dented, bulging can. D.

How does the body use energy?

6. A substance that enters Earth's cycles and does harm to living things is A. oxygen. B. hydrogen. C. freshwater. D. a pollutant.

Which enzyme unwinds and separates the two strands of the DNA double helix?