I actually need so much help with this, I’ll give extra points just PLEASE HELP

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?

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Which heredity condition causes a buildup of mucus in lungs and pancreas? a. cystic fibrosis b. heart disease c. huntington's disease d. sickle cell anemia