An example of reproductive isolation results from differences in the mating season is that of the two toad species, the American toad (Anaxyrus americanus) and Fowler's toad (Bufo fowleri). Despite their overlapping geographic range―both are found in the eastern United States and Canada―and the fact that they have been successfully bred in laboratories to produce fertile offspring, they are not known to mate in the wild because the American toad mates in early summer, while the Fowler's toad mates in late summer. a) What type of reproductive isolation is this an example of? Explain your answer.

b) Suppose that the Fowler toad mates in late summer because it is warmer in late summer. What might happen to these two populations if temperatures continue to increase?

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.