Answer:
C. active transport driven directly or indirectly by metabolic energy
Explanation:
The intestinal mucosa is the tissue that lines the inner walls of the intestines. It is characterized by the pleated appearance, which facilitates the absorption of nutrients already deferred and the formation of fecal cake. Most nutrients are absorbed by this region through active transport directly or indirectly driven by metabolic energy.
Answer:
increase the productive or esthetic value of an organism to our
Explanation: Artificial selection aims to increase the productive or esthetic value of an organism to our advantage. In the field of biology, artificial selection covers a whole host of subtopics. One can implement artificial selection to eradicate disease, increase yield per acre, lower competition within an ecosystem, or produce a new color in a breed of dog.
Answer:
A) The pollen grains will be pure red.
Explanation:
Plants have alternation of generations, this means that there are two different stages in their life-cycle: a sexual haploid (n) phase and an asexual diploid phase (2n). These phases occur in different individuals, so there is an haploid plant called gametophyte that carries gametes and after fecundation, it will rise a diploid sporophyte (asexual).
In seed plants, the sporophyte is the plant that we normally see, and the gametophyte is reduced into an organ of the sporophyte. The male gametophyte is the pollen that is produced in the sporangium in anthers (parts of sporophyte). When a pollen grain fecundes a female gametophyte (egg), it will produce a diploid embryo or new sporophyte.
Therefore, if the researcher exposes pollen to both stains, these grain will stain red, because red stain identifies gametophyte tissue.
Answer: B) It controls the autonomic nervous system and regulates hunger and thirst sensations.
