It's actually A. Vertebrate have a hard out shell.
Answer: 1/4 (4 out of 16 offsprings express one of the two dominant alleles)
Explanation:
The dominant alleles are A and B
At the end of the cross AaBb x AaBb, 16 offsprings would result. They are as follows: AABB, AABb, AaBB, AaBb
AABb, AAbb, AaBb, AABB,
AaBB, AaBb, aaBB, aaBb,
AaBb, Aabb, aaBb, aabb.
Of all, only 4 offsprings (aaBb, aaBB, AAbb, Aabb) expresses one of the A or B. so 4/16 = 1/4
Answer: if the trees and lakes were destroyed there would be no homes for most animals and they might become exctinct. Trees provide us paper and oxygen, store carbon, stabilise the soil and give life to the world's wildlife. They also provide us with the materials for tools and shelter.
Explanation:
Answer: C) Prokaryotes convert nitrogen-containing molecules into forms that can't be used by other organisms.
Prokaryotes are the organisms that do not have a membrane bound nucleus, mitochondria and other organelle. They ranges in size of diameter from 0.1–5.0 µm.
Example:<em> Escherichia coli, Sulfolobus acidocaldarius archeobacterium </em>
Decomposers, play an important role in nitrogen cycle. Nitrogen gas is converted to nitrate compound by nitrogen fixing bacteria which are present in root nodules of leguminous plants.
Example: <em>Azotobacter </em>
Planting vegetation so the roots of the plants hold the soil together.