A substance that enters Earth's cycles and does harm to living things is

a. a pollutant.

b. hydrogen.

c. freshwater.

d. oxygen.

Which statement would least likely be used to describe variation? O Variations are inherited differences between individuals of the same species. O Variations that decrease reproductive success are more likely to be passed on.

Potential energy is a. electric charges. b. stored energy. c. energy being used.

An example of skeletal muscle is? a. the heart b. the lungs. c. the leg d. the stomach

A survey on the Pacific coastline of California shows that kelp is currently being harvested faster than it can grow back. How would this resource be classified? A) Renewable B.) Nonrenewable C.) Potentially renewable D.) Primarily nonrenewable

The main source of organic matter in soil is A. water. B. bacteria. C. fungi. D. plants.

Using the Punnett squares, determine the possible blood types of the offspring and the ratio of phenotypes when: a) Father is type O, and mother is type AB. b) Father is type A, heterozygous, and mother is type B heterozygous.

Which term refers to the final stage in a forest's development

Most of the nitrogenous waste in the body is a result of: A. fat metabolism B. protein metabolism C. carbohydrate metabolism D. erythrocyte breakdown

How are arctic have different from hare that live in the arctic?

Explain biodiversity