The tapeworm is a parasite, and the dog is a host.
A. they have a higher proportion of adenine–thymine than guanine–cytosine base pairs.
The option A represents the complete opposite of "high-gc gram-positive bacteria". High GC content means that this bacteria have more guanine ans more cytosine than the other base pairs- adenine–thymine. This means all the other options are correct.
Answer:
Symbiosis is a close relationship between two species in which at least one species benefits.
Explanation:
the key element in the ecological concept of species is that individuals within a species can successfully interbreed and conceive healthy offspring
