C. Helpful variations accumulate among surviving members of a species
Answer: to fight against foreign antigens
Explanation: lymphocytes is a type of white blood cell that helps fight against invaders or foreign body in our body system. They are found mostly on the lymph and blood
There are basically two types of lymphocytes;
T lymphocytes- It develops from the thymus and Its functions by identifying intruders and then respond by eliminating them.
B cell or lymphocytes develop from the bone marrow hence the name B cell. It functions by creating some antibodies that destroy the effect of invaders that causes adverse effect.
Answer:
creo que la respuesta es cuádriceps femoral
The definition of Xylem is “the vascular tissue in plants that conducts water and dissolved nutrients upward from the root and also helps form the woody element in the root system. Therefore the answer is “transport water and minerals upward.” I hope this helps!
