Which statement is true about model organisms? They are complex and difficult to maintain. They breed very slowly and in very low numbers. They help scientists understand biological processes. They are randomly chosen species. Which statement is true about model organisms?

They help scientists understand biological processes.

Explanation:

A model organism is a non-human species that has been extensively studied and used in a laboratory setting as they help scientists to understand various biological processes. These organisms are used because they usually are easy to breed and maintain and because they share some similarities with humans in the biological process being studied.

Many model organisms can reproduce in large numbers and have very short generation times, which can enable several generations of the organism to be studied within a short time period.

Some model organisms used extensively in scientific studies include, yeast (Saccharomyces cerevisiae) , fruit fly (Drosophila melanogaster)  and mouse (Mus musculus)

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.