<u>Answer</u>: c. a and b
Trees play vital roles in the production of oxygen as well as the fixation of carbon from 
. As trees use nitrogen, phosphorus and water as nutrients for growth, their diminishing numbers would change the balance between these three elements significantly.
Thus, during rains, the water level will rise much faster and higher in the absence of trees. These could possibly lead to increasing cases of devastating landslides.
This is the breathing process. Hope this helps.
The answer is 90 degrees that is what angle nurses inject medication with
Fats are a better source of energy than carbohydrates on a per carbon basis because one triglyceride molecule yields three fatty acid molecules.
<h3>
What is Fat?</h3>
This is an important energy source in the body and is usually stored in the body under adipose tissues.
They contain triglyceride with as much as 16 or more carbons in each one which helps to generate energy in a slow and efficient manner.
Read more about Fats here brainly.com/question/4176733
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