Why can't the evolutionary relationships between certain species be explained thoroughly?

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.) chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

Which chemical equation is unbalanced? which chemical equation is unbalanced

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity