What are antigens?
A. proteins secreted by virus infected cells that interfere with further infection by viruses

B. molecular markers on cells that identify those cells to the immune system

C. Y shaped proteins found in the blood that cause foreign cells to clump together

D. lipid markers that are released by B cells to immobilize symbionts

ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )

correct answer: false

while planning water activities, it is very important to consider the weather, because if we do not plan and are going for a surf, then it might be that the hurricane came and drown us or may carry us to long distance from where we can not come back. there are many reasons to take information about the weather when we are planning any water activities.

hence, the correct answer would be false.

not always but somethings can be reproduced in a laboratory.