How are jetties and groins similar in how they manage beach erosion? (1) Both are hard structures that keep sand on the beach.
Both use vegetation to keep sand on the beach.
Both are soft alternative strategies that use barriers to keep sand on the beach
Both use beach nourishment to replenish sand on the beach.

it would be c. xylem.

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.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

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