Hello!
Although vaccines sound as if they are a medicine made to resist an infection or disease, this is not entirely what they are.
A vaccine is often a dulled version of a disease. This causes your cells to fight the dulled disease/infection. Your memory cells will remember how the vaccine's dulled disease was fought, and it will prepare your body to fight the full disease if you catch it in the future.
I hope this helps answer your question!
Most fish (especially the "Bony fish") achieve neutral buoyancy through a sac called the swim bladder in there body of which is filled with air, not much but it'a just enough to keep then a float. The fish can control this organ, and using that they can fill or release air to allow them to rise or sink.
Cartilaginous fish however, do not have a swim bladder.
hope this helps :)
Answer:
Occurrence and accumulation in time of new mutations in each of the separated populations. This leads to a gradual differentiation.
Explanation:
Allopatric speciation consists of the geographic separation of an original population so that it can give place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flux, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.
The process of allopatric speciation involves different steps:
- The emergence of the barrier,
- Interruption in the genetic interchange,
- The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation,
- Genetic divergence by natural selection and reproductive isolation, which makes it impossible for the two groups to cross even if the barrier disappears,
- Prezigotic isolation mechanisms favored by selection once it occurs a secondary contact between the new species in formation.
Answer: An exoskeleton
Explanation:
Just did the question and got it right.
Answer:
as the population of the lynx decreased over time, the snowshoe hare's population increased. when one of the species populations changes, the other does as well along with it. this trend says that these species are dependent on each other.
Explanation: