Why are marine scientists particularly concerned about parasites in the blue crab population?

List two limitations of natural selection

What happens whenever a net force acts on an object

20. in humans, freckles are dominant to no freckles. trey has no freckles and his wife anna grace has freckles, but her dad doesn't. they want to know what percentage of their kids would look like trey. show a punnett square to support your answer.