Photosynthesis is composed of two main parts (light-dependent and light-independent). photosystem i (ps i) and photosystem ii (ps ii) are alike in many ways. how does photosystem i and photosystem ii differ from one another?

Explanation:

PS I absorbs longer light wave length and does not deal with photolysis of water. PS II absorbs shorter light wave lengths and does deal with photolysis of water. They both send information to different primary receptors. PS I obtains electrons that flow down a electron transporter from PS II where as PS II gains electrons from water.  

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.