Answer: B
Explanation:
If he saved the seeds and waited till summer the rays of light would make the flower red.
<span>Some bacteria in the soil fix nitrogen into useful forms for plants to use them. This conversion of nitrogen helps plants grow. Without the bacteria in the soil a lot of the plants would not be able to grow.</span>
<span>2. This type of microscope is called a scanning electron microscope. 3. The difference between these two cells are that one has a nucleus and the other one doesn't. A eukaryotic cell has a nucleus and a prokaryotic does not.</span>
Answer:
The embryo develops the heart, nervous system and face.
Explanation:
The nervous system is one of the first things to develop, following is the heart and then their face. Physical traits which also develop are the arms, legs and sexual organs.
Answer:
Results in the evolution of the species: Directional selection
Results in new species: Disruptive selection
Favors traits at the two extremes: Disruptive selection
No increase in diversity: Directional selection
One extreme trait is favored: Directional selection
Diversity decreases: Stabilizing selection
Diversity increases: Disruptive selection
Explanation:
Directional selection which is also known as positive selection is known to be a mode of natural selection. In this type of selection, an extreme phenotype is favored over other phenotypes. This makes the allele frequency to move in the direction of that phenotype and this takes place over time.
Disruptive selection (known to be diversifying selection) talks about the certain changes in the population genetics whereby extreme values of a particular trait are favored over intermediate values. This results in new species.
While Stabilizing selection is a natural selection whereby there is a stabilization of the population mean on the particular value of a non-extreme trait. Here the diversity is decreases.
