What type of transport takes place when a protein allows an ion to enter a
cell, but no additional energy is needed to make this happen?
A. Endocytosis
B. Active
C. Facilitated
D. Osmosis

i'm sorry, but can you list the answers? i cannot with something i don't know the answers to

,

chris

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.