I have Biolgy qustionss.?

Question

1.how do fish gills maximize the surface area available for oxygen exchange?

2. Why does countercurrent flow allow the fish to increase the amount of oxygen extracted from the water?

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A. How do reptiles compensate for a lack of supplemental oxygen intake through moist skin like that of amphibians

b. Do you think internal fertilization or the development of scales is more important to reptiles discuss the benefits of both adaptations and their relative importance to the species

Answer 1

imagine a gill slit is a page in a book now if u open a book up slightly u see the individual pages, now just as the air is between each page of that book so is it between each gill.

gills have a large surface area because it is the shape of what i described above... also there are tiny blood vessels on the entire surface.

conter flow: the water runs over the gills, then it absorbes o2

when the water is flowing back over the gills to the outside agian it absorbes the remaining o2, thus gaining more oxygen

the third is because they have better developed lungs :)

internat fert is nb for them, they have evolved it for a reason (natural selection favoured this ability, same with scales.)

both are protection, scales from penetartion of teeth both predators but also same species, it also helps with absorbing the sun,

fert, because free floating eggs and sperm only really have a 1% fer rate and needs millions of eggs and much more spem, to make a few thousand, then only a couple of those will survive if lucky