Answer:
B - C - D
Explanation:
Really?
You choose 3 so you single out the wrong one.
The first one is clearly not the answer so just choose the other three.
Because, when more species start to become extinct it disrupts the balance of the earth. For instance if spiders became extinct, the numbers of insects would exponentially grow. Which will become a problem for farmers, and more diseases would most likely occur.
Answer: A
Explanation:
Oxygen makes up another 20 to 21 percent of our atmosphere. It's essential for life on Earth, and interestingly enough, it is poisonous when highly concentrated. Our concentration of 20 to 21 percent seems just right.
Answer:
inherited condition in which there aren't enough healthy red blood cells to carry adequate oxygen throughout your body. these irregularly shaped cell can get stuck in small blood vessels which can slow down or block blood flow and oxygen.
Explanation:
Answer:
Hope the above picture might help you :)