Nick is conducting a controlled experiment to test whether music daisies grow faster. below are the steps to nick's experiment: 1. plant daisies in two separate flowerpots. 2. place flowerpot 1 in a green room with music. 3. place flowerpot 2 in a similar green room without music. 4. give the daisies the same amount of food and water each week. 5. measure the growth of the daisies. 6. draw conclusions based on the data collected. which is the experimental group in nick's experiment (which group did the variable affect)?

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'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

feral cats are estimated to eat tens of millions of native animals each night in australia