The first two steps in the formation of the sun are listed below.

A cloud of gas and dust called nebula spins slowly.
The nebula collapses due to condensation of gases.
Which of these statements best describes the next step in the formation of the sun?
The cloud spins faster as it collapses and flattens into a disk.
The cloud slows down and expands to form a flattened disk.
The nuclear fission of the gas molecules takes place at the center of the disk.
The nuclear particles in the center of the nebula repel each other and move apart.

The nuclear fission of the gas molecules takes place at the center of the disk...

Explanation:

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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.