Mutualism because both animals benefit. The Elephant gets relived from the parasites that are on it and the bird gets food.
B. thick atmosphere
You can also use quizlet to look up answers also, I'm in college and they have never failed me.
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.
They both need nutrients and are able to reproduce
