<h2>Asteroid impact and Dinosaur extinction. </h2>
Explanation:
The scientists suggest that when a sufficiently large asteroid or comet struck the earth surface, they might have caused dust particles to rise up in the atmosphere and form a thick covering on the earth blocking the sun rays.
The blocking of sun rays must have resulted in severe colds and plants failed to carry out photosynthesis. Since, the plant died out , the herbivores got extinct because of the lack of food.
The loss of herbivores resulted in shortage of food for carnivores, and the larger carnivores started feeding on the younger population of their own species. Day by day the population size diminished and the dinosaurs along with some other species of plants and animals got extinct.
Whales are mammals and do not have gills, so they cannot take the dissolved oxygen that is in the water and turn in into a oxygen that they can breath.
A descriptive observation may very well be a mixture of both quantitative and qualitative as it can utilize elements of both types. Qualitative deals with the kinds of observations that cannot be measured in numerical form. Quantitative data is just that.
Store and transmit genetic information: nucleic acid Are primarily used to store energy: lipids Help regulate cell processes: proteins Are used for main source of energy: carbohydrates
The answer is aerobic. Although cellular respiration can happen anaerobically and aerobically, the question states that it requires oxygen. Therefore, it is aerobic.
