This is the likelihood that exposure to a hazardous substance may damage the health of the exposed person.

Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air

How does secondary succession differ from primary succession?