Answer:
Post reproductive isolation → Hybrid sterility
Explanation:
The biological concept of species states that individuals of a species can not mate and reproduce with individuals of another species. But if they get to reproduce, the progeny will not be viable or fertile. There will not be any reproductive success.
There are different reproductive isolation mechanisms, which are barriers that inhibit or interrupt the genetic flow between different species.
Reproductive barriers are isolation mechanisms that prevent mating between two or more species. The prezygotic mechanism avoids fertilization between individuals of different species, while the postzygotic mechanism impedes the zygote to develop and reach the adult stage.
Postzygotic mechanisms or barriers include
- Hybrid inviability,
- Hybrid sterility,
- Hybrid decreased viability or fertility,
- Cytoplasmic interactions.
In the exposed example, it seems that the mountains separating the frogs´ populations made a place for the development of postzygotic barriers, specifically hybrid sterility. Frogs from one population get to mate and produce offspring with the frogs of the other population, but their progeny is sterile.
Answer;
increase the intensity of their workouts
Teenagers who score below the health standard in a specific fitness component may need to increase the intensity of their workouts.
Explanation;
Exercise intensity is how hard one should exercise to improve fitness. All exercise should be hard enough to demand more effort than usual.
Frequency of exercise refers to how often one should exercise to improve a component of physical fitness. Refers to the fact that exercise must be performed regular if you are to reach and maintain an adequate level of physical fitness.
The following are the characteristics of Cnidaria:
1. The organisms have specialized stinging cells known as cnidocytes.
2. Two types of body plans exist, that is, polyp and medusa.
3. The phenomenon of alternation of generation is observed.
The following are the characteristics of Porifera:
1. The organisms lack symmetry.
2. The adult forms are sessile.
3. The organisms obtain food by filtering water.
The taller man's condition which is due to a malfunction in the pituitary gland is called Gigantism. This condition is due to the malfunction in the pituitary gland, which secretes too much growth hormone, which is known as somatotropin. This condition is usually because of a tumor in the gland. The pituitary gland is a pea-sized structure which is located at the base of the brain.
