Hmm, learning about this what a while back, but i would say (1)
Answer:
All fungi are heterotrophic. (B)
Answer:
if these mixtures are feed as only source of food African grey parrots become ill and ultimately die.
not sure about the answer but see if this is correct.
The answer is: It is an explanation for an observation.
Explanation:
A hypothesis is a suggested explanation that is both testable and falsifiable. You must be able to test your hypothesis, and it must be possible to prove your hypothesis true or false.