Chloe explains to Jordan the importance of photosynthesis in an ecosystem. Which sentences should she use in her explanation? A. Photosynthesis provides food for plants.

B. Photosynthesis by animals is an important role in the ecosystem.

C. Photosynthesis does not need carbon dioxide; it needs only sunlight.

D. Since plants need water, photosynthesis cannot occur in desert ecosystems.

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.