Answer:
D. By diffusion across a capillary wall
Explanation:
D is the best answer because gas exchange takes place in our lungs. Our lungs have alveoli which have a network of tiny blood vessels called capillaries, here the O2 diffuses the capillary wall to enter the bloodstream, and similarly CO2 diffuses out and we exhale it our from our lungs.
Their purpose is reproduction.
Answer:
Toothpaste
Explanation:
Toothpaste commonly uses minerals like calcium and fluoride, hope this helps :)
The chlorophyll stops being produced because it is to cold
Answer:
Sexual reproduction is the joining of gametes to form a different organism while Asexual reproduction is the duplication of the first organism to form an identical organism.
Explanation: