4.21 x 10 to the -4th power
Answer:
some organisms fit into more than one category
Explanation:
Its Right
R is a dominant allele and r is a recessive allele. For the organism to be a homozygous individual, it would have to be either RR or rr. Since the organism is Rr (both alleles), it is heterozygous.
You can remember the difference between homozygous and heterozygous by the words' prefixes:
- the prefix homo- means "same"
- the prefix hetero- means "different"
I'm going to go with A. This is because the population of frogs is definitely decreasing, as they are loosing food. Also, the frogs are prey for the snakes, and if there are no frogs for the snakes to eat, the population of snakes can go down, too.
Hope this helps!