Select all the correct answers. Alfred has a golden retriever named Max. Max can recognize people from their smell. Max starts to bark and wag his tail when Alfred reaches the gate of his house, even though Max is 50 yards away in his kennel. What are the reasons for Max’s ability to smell so well?
Dogs have more olfactory receptors in their noses, allowing them to identify people by their smell.
Dogs have highly sensitive olfactory receptors, allowing them to distinguish a person’s unique odor.
Dogs have better eyesight than humans, allowing them to see faraway objects.
Dogs have an extended nervous system, allowing them to detect even the slightest movement in humans.
Dogs have connected optic and olfactory systems, allowing them such precision in smell.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.