Which organelle can be compared to a security guard who decides whom may enter s building snd whom may not

Many kangaroo rats live in the sonoran desert of the southwestern united states. they have a variety of adaptations for living in the desert. under which circumstance would the kangaroo rats of the sonoran desert be most likely to develop new adaptations by natural selection?

Identify any four organelles that should be present in the eukaryotic organism and describe the function of each organelle

What is the problem in this article? what solution does the article propose?