A parasite by definition is a living organism that lives at the expense of another organism (the host). This could help to answer your question.
Parasites can have a sexual or asexual reproduction (or both of them). So we have two types of hosts:
Intermediate host: It helps parasites to grow in number and have an asexual reproduction.
Definitive host: It helps parasites to fertilize (having sexual reproduction).
Let's take the example of Plasmodium (responsible for malaria), the definitive host (the anophele) contributes to transmitting the parasite to the human. without it, the Plasmodium cannot be transmitted to humans (intermediate host) to reproduce. And without humans, it cannot reproduce too, because this is where the parasite takes its resources (from red blood cells).
So, we can see that hosts have a major role in parasites reproduction.
C : carbon dioxide and methane
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Approximately 90% of all living plants are group of Angiosperm
Answer: Chargaff's observation was an important clue to the A-T and G-C pairings that Watson and Crick eventually proposed. ... The structure of DNA suggested that the order of bases contains information. Because A is always paired with T and G with C, the order of bases on one strand determines the order on the other strand.
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