<span>What substances will make salt when combined</span>
Answer: hormones serve as messengers, controlling and coordinating activities throughout the body.
If capillaries were thicker, nutrient and gas transfer would be much more difficult. Capillaries are only one cell thick so that it is easy for gases (oxygen and carbon dioxide), nutrients, and wastes to diffuse into and out of the blood. If they were thick, this diffusion would be much harder or impossible.
Ok so choose 2 ecosystems which is not that hard aquatic and terrestrial research your information on the sight i can not do the work for you, don't forget to check your spelling and punctuation
