Unionid mussels are native to the Hudson River in New York State. In the early 1990s, zebra mussels were introduced into the Hudson River. The table shows the number of unionid mussels and zebra mussels over the course of six years. How did the population of unionid mussels change after zebra mussels were introduced? Why did this change occur?

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answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

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.

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)