Answer:
B. urbanization
Explanation:
In urbanizing stage, death rate quickly declined because of the improvements in agricultural aspect which goes down to food supplies, health care delivery, medicine improvements, and even the investments in sanitation and infrastructure which contributes to the increasing life expectancy of the people and lesser diseases which cause deaths. Though birth rates remain almost the same, but young population continues to grow because of the low death rate.
<span>Coral bleaching. The name is apt, as coral affected by this process will lose their vibrant color and become white, which is the color of the calcium carbonate substrate that the coral polyps build around themselves. Coral bleaching can be reversed, but only if ideal conditions return quickly.</span>
Answer: A phylogenetic tree constructed using sequence differences in mitochondrial DNA would be most valid for discerning the evolutionary relatedness of traits inherited by cellular organelles.
Explanation: Maternal inheritance or inheritance by cellular organelles are phenotypes controlled by organelle genes. Mitochondria are organelles that contain their own DNA and protein-synthesizing apparatus.
There is a widely held theory concerning the origin which proposes that they were once infectious endosymbiotic prokaryotes that evolved such a dependence on the gene product of the host that they are no longer able to function autonomously.
Secretory pathway refers to the channel through which the secretory organelles secrete proteins to the extracellular compartment.
The polypeptide transport in the secretory pathway involved the transportation of proteins from the ribosomes to the endoplasmic reticulum and then to the golgi bodies and finally to the plasma membrane.