Answer:
a. different species of birds can divide ecological spaces between them my matching the morphology to the food source.
Explanation:
Beak morphology allows the birds to select the suitable food type. The various species of Galapagos finches differ from each other in beak shape and size irrespective of their origin from common seed-eating stock.
The modification of beak shape and size into several directions allowed the finches to occupy the available empty ecological niches with respect to food types.
Diversification also reduced the competition between them and allowed the finches to colonize various ecological niches in accordance with their respective beak morphology.
You have to do the cross-back before making any conclusions.
Answer:
Fossil records provide evidence of an increase in animal species at the same time that atmospheric oxygen levels increased.
Explanation:
A huge diversification among animal species occurred with the increase in the levels of atmospheric oxygen. The reason why the number of species increased drastically was that a whole new world opened up, the land. The land was open for exploitation and taking over, with every single niche free, so animals diversified and filled in pretty much all of the niches. The fossil records give us clues when this happened, as from only microorganisms there is a sharp rise in complex animals, coinciding with the increase of oxygen levels.
If it wasn't for the increase of atmospheric oxygen though this wouldn't have been possible. The oxygen in the atmosphere enabled animals to breathe on land. Also, it cooled off the global temperatures which were too high before the increase of atmospheric oxygen, making them suitable for life. And last but not least, the atmospheric oxygen resulted in the formation of the ozone layer, a layer that started to act as protection from the UV rays.
The answer is A. the substrate serves as a key to activate the enzyme.
