Answer:
The skin surrounds the entire body just as the cell membrane surrounds the entire cell. Both the skin and the cell membrane are semi-permeable, meaning that they only allow specific substances to enter or exit the body.
Answer:
The answer is poor air quality and water quality
Enzymes are specific in nature and usually single enzyme is used in specific biological reaction !!
so True !!
A two-track mind is what i got on apex.
<span>A CD4 molecule on a lymphocyte interacts with an MHC-II molecule on an antigen-presenting cell.</span>
