I had to look for the options and here is my answer:
Based on the attached details about the cattle egrets, how an ecologist would explain this expansion is that, a habitat that has been not been occupied by the egrets and the native herons acquired the biotic and abiotic standards <span>of the cattle egret transplants and their descendants. (This is based on the actual option attached to this question.)</span>
Answer:
adaptations are compromises
Explanation:
The pleiotropic gene involved in sickle-cell anemia is an example of heterozygous advantage. This means that the heterozygous genotype is favourale over other two genotypes (recessive homozygous and dominant homozygous). Eventhough it has harmful effect (sickle cell disease carrier) heterozygous genotype enables resistance to infection (malaria) and that is why this genotype is still favourable by natural selection. This phenomenon is evidence of compromise between harmful ad benefit.
I believe this adaptation of the blue poppies to their environment is due to directional selection. Directional selection refers to the mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of the favored phenotype. In our case the plants with the thickest leaves were favored as they were more adaptable and in the end there was a shift to this characteristic by other plants.
<span>The ovaries produce estrogen and progesterone in women. Both play an important role in the menstrual cycle: estrogen stops FSH production and stimulates LH release by the pituitary gland. Progesterone maintains the uterus’ lining. Men also produce estrogen, though at lower levels, and this is done through changing testosterone into estrogen with an enzyme.</span>
Answer:
Ocean is the answer. Because it consists in fresh waters and marine
