Answer:
Because natural selection selects for it. Thus it persists.
Explanation:
You have to understand heterozygote advantage. Basically, it's where heterozygotes have an advantage over homozygotes. In the case of sickle cell disease, heterozygotes have an advantage, and natural selection favors whatever is advantageous. Thus, because heterozygotes each have one recessive sickle-cell allele, as natural selection favors the heterozygotes, the recessive sickle-cell allele persists and remains in the gene pool.
TRNA and mRNA i would say
The brain contains
billions of interconnected neurons and glia. <span> Glia cells</span><span> enclosed the neurons and provide support for and insulation
between them. It is also the most abundant </span>cell types in the
central nervous system. While Neurons are the basic units of the nervous system and it is the
most important part is the brain.
<span> </span>
Answer:
A. It is the place where energy is produced.
It stores the genetic information, the DNA (chromosomes).
Explanation:
It would be a young puppy learns to beg for food by watching a older dog
