Question

Paheli wants to know whether mosquitoes, bed bugs, lice and leeches that suck our blood are also parasites.

Answer 1

Parasites are those organisms which live, feed and depend on another organism. Parasites permanently live on their hosts.
How ever mosquitoes, bed bugs, lice and leeches don't fit into the exact definition of 'parasites'. They may feed on our blood, but they certainly don't live and depend on us. Nor do they use our nutrition for their own life.
These are more of predators rather than parasites.

Answer 2

Answer: Yes, the animals such as mosquitoes, bed bugs, lice and leeches that suck our blood are also parasites

Explanation: Because these organisms derive their nutrition from host(human)