Answer/Explanation:
In humans, we breathe in oxygen via the respiratory system. The oxygen enters the lungs. The air sacs in the lungs - the alveoli - are the site of gas exchange in the lungs and are where the circulatory and respiratory systems interact.
The alveoli take in the oxygen, where it diffuses into the capillaries (circulatory system). Blood, which passes through the capillaries takes this oxygen to all the cells in the body. Oxygen binds to haemoglobin in red blood cells, which transport it around the body.
Additionally, blood also transports carbon dioxide back to the alveoli of the lungs, where it diffuses into the lungs and is expelled when we breathe out
Lysosomes use a degenerative enzyme to eliminate un necessary materials from the cell and recycle parts that can be re used, much like a recycling centers eliminate waste from cities and find ways to reuse it.
Answer:
B. From low concentration to high concentration
Explanation:
I got it right on edge :)
natural selection is an species wich are adapted to their environment
C
in the first paragraph a fact is challenged
and the second one provides an example
