Nitrogen is a limiting plant nutrient because the bulk of the available nitrogen in the atmosphere is not usable by plants.
Plants are not able to make use of the nitrogen in the atmosphere directly. Atmospheric nitrogen needs to be converted into usable forms before it can be accessed by plants.
The conversion of atmospheric nitrogen to usable form by plants is known as nitrogen fixation and this is achievable by the activities of certain bacteria.
More on nitrogen fixation can be found here; brainly.com/question/4191267?referrer=searchResults
Answer:
There are fewer collagen and elastic fibers in the reticular layer of the dermis as we age, contributing to wrinkling and increased susceptibility to tearing of the skin.
Explanation:
As we age, environmental damage, such as ultraviolet radiation, and decreased ability of our fibroblasts to renew collagen and elastic fibers make our skin thinner and more vulnerable to mechanical trauma.
Answer:
Environmental Tobacco Smoke
That would be active transport
