Its A because dolphins like to fallow boats not to be scared
Corals are cnidaria which makes coral reef which is of calcium carbonate and act as eco system in deep marine water !
so the most appropriate answer is C !
Answer:
sunburn is caused by too much exposure to ultraviolet rays.
Explanation:
Melanin is the dark pigment in the skin's outer layer that gives skin its normal color. When your skin face too much exposure to sun. UV rays in sun destroys the melanin due too which sunburn is caused
Answer:
On a graph, points are grouped closely together.
I only put one answer because the choices repeat.
Answer:
Sickle cell disease is due to a type of substitution mutation.
Explanation:
Sickle cell disease is a condition that is transmitted from parents to children in an autosomal recessive inheritance pattern. It is due to a mutation that is capable of altering the shape of the erythrocyte, as well as its ability to circulate and carry oxygen.
The mutation that occurs in sickle cell disease is due to an alteration in the β-chain of hemoglobin, caused by the substitution of thymine base by adenine in the DNA that determines it. As a result, valine replaces glutamic acid in the β-chain amino acid sequence, with the consequences described.
- <em>The other options are not correct because </em><u><em>deletion, duplication and translocation </em></u><em>correspond to chromosomal mutations, not responsible for sickle cell disease.</em>