Answer:
b) contact transmission.
Explanation:
Contact transmission of pathogens occurs directly or indirectly between the source of the pathogens and the host organisms. During contact transmission by droplet spread, the pathogen is carried on smaller particles. These particles move through air for a very short distance, usually less than a meter. Therefore, droplet transmission of a pathogen requires that the source and host are present in close proximity.
Mutations acquired by somatic cells are generally only retained by the individual they acquire in as there is no vector by which to transmit the mutation.
<span>Between generations, the only mutations that may be transmitted are those already acquired from a parent, and those that occur within the individuals own germ cells. If mutations in the germ cells result in sperm or eggs that contain that mutation, then they may be transmitted to their offspring. </span>
<span>Red blood cells in all humans and other mammals, though, don't contain nuclear DNA and as such cannot acquire mutations.</span>
A-Weight of water collapses lime stone below it, water drains into the sinkhole
Answer:
<h2>
Liver
</h2>
Explanation:
1. Glucagon: it control the glucose levels in the blood.
2. Glucagon is produced by the alpha cells, in the pancreas.
3. It prevent dropping of blood glucose levels too low. so, it acts on the liver in many ways:
4. It stimulates the breakdown of glycogen which is stored in the liver into glucose, which finally released into the bloodstream, this process is known as glycogenolysis.
5. It also stimulates the production of glucose from amino acid molecules and some other non carbohydrate pre-cursors, by the process known as gluconeogenesis.
Explanation:
The South American and African plates moved apart as a divergent boundary formed between them and an ocean basin formed and spread. At divergent plate boundaries, rock rises from the mantle and hardens, adding new solid rock to the edges of both plates.
