Animals must obtain energy from sources outside their own body. which of these substances is a source of chemical potential energy that animal cells can use?
a. soil
b. air
c. iron
d. sugar

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Plz ! cattle ranchers and dairy farmers rarely allow all of their animals to reproduce instead they practice selective breeding and only encourage the reproduction of animals with specific features. which of the following cows would a dairy farm most likely choose to reproduce? a. a cow that makes a lot of milk. b. a cow that can run quickly. c. a cow with a think, soft fur. d. a cow with large, strong hooves.