Carbon
reason being that if you've studied the carbon cycle, you know that carbon goes into the atmosphere and is absorbed by plants. but if we produce more CO2 than plants can absorb, it causes more rays from the sun to be concentrated to the earth, rather than being reflected away
Answer: Option B) Antigens
Blood typing is based on the presence of proteins known as antigens on the outer surface of the red blood cell plasma membrane.
Explanation:
Blood groups A, B, AB, and O are determined based on the antigen-antibody reactions between donor and recipient bloods.
For instance,
- Blood type A has antigen A on its plasma membrane
- Blood type B has antigen B on its plasma membrane
- Blood type AB has both antigen A and antigen B on its plasma membrane
- while blood type O has neither antigen A nor B on its plasma membrane
So, antigens is the answer
<span>Knowing the correct blood type is essential, for col. Lemon that has a blood type of ab-, the three suspects that could safely donate blood for him are the person that has a blood type of AB-, A-, B-, O-. Moreover, blood type classification is based on the presence and absence of antibodies and inherited antigenic substances on the red blood cells. In addition, blood type is inherited from both parents.</span>
Answer:
C
Explanation:
Many kinds of air pollution can't be seen, which means A is incorrect. Any kind of pollution can be harmful to you, which means B is incorrect too. Air pollution is very harmful but in most cases can't be directly seen, so C is correct. Pollution can be found everywhere, so D is incorrect also.
