Answer:
The correct answer is- a portal triad.
Explanation:
The building block of the liver is hepatic lobules. They are different from the lobes or are smaller lobes. It comprises of a portal triad and hepatocytes and they are microscopic structures.
Portal triad is composed of mainly three tubes that are:
1. Branches of the hepatic artery which functions in carrying the oxygenated blood to the parenchymal hepatocytes.
2. Branch of hepatic portal vein that carries blood enriched with nutrients from small intestine and
3. A small branch of the bile duct that carries digestive bile from hepatocytes to gall bladder.
Therefore the correct answer is portal triad.
I believe the answer is B. Carbon is NOT a macronutrient since <span>Nutrients are classified as macronutrients and micronutrients. </span>
A gamete will have exactly half the number of chromosome ,that is haploid,therefore ,19
C both. it changes in different regions
Answer:
This is an example of directional selection.
Explanation:
Directional selection is a type of positive selection where the evolutionary fitness of one genotype is higher compared to the other ones, thereby favoring the selection of one particular phenotype and shifting allele frequencies towards the selected genotype. In a biological context, the directional selection increases the chances for surviving and for reproducing in those organisms that have the alleles favored by this type of selection. Thus, the directional selection produces the loss of genetic variability and leads to the fixation of the dominant alleles.
