Please help! will give brainliest.

Answer and Explanation:

1st part: The Earth goes through seasons because parts of the Earth are facing the Sun and the other side of the Earth isn't. When you are facing the Sun directly, it is summer. When you are on the opposite side of the Earth, it is winter. 2nd part: Canada gets cold often because it is farther from the Equator (the middle of the Earth) where the Sun is closest to the Earth.

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.