Which colors are absorbed worst by plants?

What is the ecological role of food chains and food webs

Need with these questions . need the answers in a rush for these questions are the answers i put down are correct or not? ?

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species