Of the following individuals, which person is the most likely to engage in leisure-time physical activity?
a. a newly retired township firefighter
b. a young, single mother
c. a young man with a white-collar job
d. an east coast grandmother

The correct answer is C)  A young man with a white-collar job

A young man with a white-collar job is the most likely to engage in leisure-time physical activity because he does not have enough responsibilities. So, in order to pass his time he will engage himself in a leisure-time physical activity.

Whereas, a newly retired township firefighter is old enough to participate in physical activities. On the other hand, a young, single mother will have other responsibilities so she will have no time to engage in physical activity.  

Similarly, a grandmother is old enough so she will not participate in any physical activity.

Thus, option C) is the right answer.

a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation:

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.