Conservationists help to restore ecosystems. Which activity will positively affect the abiotic conditions of an ecosystem? A.

Keeping lakes and rivers free of pollution.

B.

Planting new trees to provide food for animals.

C.

Monitoring the ecosystem for bacterial pathogens that can cause illness.

D.

Mating endangered animals in captivity and restoring them to their natural habitat.

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.

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products