What features of the habitat of internal parasites ensure their survival? Name at least three features.

Internal parasites survive for several reasons, including:

1) Relative constancy of environmental conditions. In living organisms, the temperature is maintained at an almost constant level, so parasites may not be afraid of changing conditions.

2) In the host’s body, a lot of food is available to the parasite, there is no need to spend energy to get it. Nutrients enter the parasite’s body directly (for example, from a tapeworm), or it feeds on host tissues (for example, blood or skin particles).

3) The parasite may not be afraid of enemies, the host’s organism gives him reliable protection, in contrast to free-living animals, which are constantly fighting for existence.