Answer:
Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released by people burning fossil fuels.
contribution is the answer
1. natural selection acts on existing traits because you can not evolve into something you didn't have
2. original structures evolve to accomplish new function in order to survive
Answer:
Typically, tortoises live entirely on land, while sea turtles live entirely in the water – they only come on land to lay eggs.
Explanation:
i know a lot about turtles and tortoise
Endoplasmic reticulum is the answer.
