Answer:
Explanation:
By the availability of food in plain open. If the main source of food for a certain bird species would be hidden safely in small and hard-to-reach places, then the bird beak would look differently over successive generations, compared to those where food would be easily found on the open.
Answer: D. Glutamine and Valine
Explanation:
<span>To generate oxygen in an apparatus, the gas stored must have oxygen in it. Then the remainder gas is either burnt or released in air. CO2 is one gas that has oxygen. If the apparatus has CO2, I can generate oxygen. After taking oxygen from CO2 in the apparatus. The gas which remains is C that is carbon. This gas is released in the air mostly in open.</span>