In creating a model of our living planet, scientists need to consider four major earth systems. briefly describe these four systems, and then explain why it is difficult to study these systems individually.

Anybody who knows ap biology, can you friend or message me

In this assignment, you will analyze an example of speciation by researching the finches of the galapagos islands. then you will answer questions to construct explanations and draw conclusions based on the information you gather. someone plz !

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure