Answer:
The death rate is higher than the birth rate. The birth rate is higher than the death rate.
Explanation:
Answer: The lungs are well supplied with blood due to lots of capillaries covering the alveoli, constantly maintaining a large diffusion gradient, air is able to pass easily down this gradient due to the alveoli having very thin walls (one cell thick).
or
The alveoli are adapted to make gas exchange in lungs happen easily and efficiently. Here are some features of the alveoli that allow this: they give the lungs a really big surface area. they have moist, thin walls (just one cell thick)
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Explanation:
Copyright is a thing saying that you can copy it but you have to get permission. It is important because otherwise people can just steal credit and get glory while basically doing nothing.
The shedding of the endometrium occurs during ovulation resulting from a decrease in progesterone
