The earthworms nephridia filter out wastes. which human organ have a similar function

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

Place the steps tor the formation of the enzyme pepsinogen in correct order

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism