What is the probability that a couple with two children will have one boy and one girl?

Which technically is nasa developing that will astronauts reach mars

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.

What is the ecological role of food chains and food webs