The question is incomplete. The complete question is:
Question: Select the correct statement about the special fetal blood vessels.
A The umbilical vein becomes the ligamentum teres.
B The distal parts of the umbilical arteries form the superior vesical arteries.
C The hepatic portal vein forms from the umbilical artery.
D The fossa ovalis becomes the f
oramen ovale.
Answer:
C) The umbilical vein becomes the ligamentum teres.
Explanation:
After birth, many vascular changes occur in the newborn child as the pulmonary, renal and digestive systems start functioning. As the umbilical cord is tied off and severed, the blood does not flow through the umbilical arteries. The umbilical vein in the child collapses but remains as the ligamentum teres. Ligamentum teres is a round ligament and serves to attach the umbilicus to the liver. It is present in the free border of the falciform ligament of the liver.
Answer:
problems of population growth are
- economic causes
- economic status
- Poverty status
- Occupational status
- Unemployment
Explanation:
1. Economic causes : the economy always affect the fertility rate of any country. parents in backward communities considered their children as sources of income in future. most of these parents think that producing more children is helpful addition to the workforce and a means to increase the agricultural production.Economic causes refers to those aspect of our life that affect the population size from economic point of view.
2. Economic status: number of children are more in agro based communities. economic status also increase the population.in agricultural countries like I was all the works are done manually so more level forces are working people are required. farmer think that if they have large family they will accomplish their works easily and they will not have to hire people. they will be able to save the unnecessary cost . In other words ,the polar parents give birth to many childrens. it helps to increase the population.
3. Poverty: Poverty is another important factor of population growth in every country.many people of their country are under the absolute poverty line.they think that the birth of a son is the prospect of income in the family and he will drive them away from the poverty-stricken life.earn more money to wipe out their poverty. similarly, many pop people are deprived of even basic needs. education becomes an additional need to them. Then, the same vicious circle of illiteracy binds them within the same boundary of inner ignorance and poverty. Therefore,poverty plays an important role to increase the population of any country.
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Answer:
A. Archaea have DNA that is not in a nucleus.
Explanation:
Eukaryotes are the organisms that have well defined membrane bound nucleus and other membrane bound organelles in their cells. The domain eukarya include both unicellular and multicellular organisms. Archaea include the unicellular prokaryotic organisms that lack the membrane bound nucleus and membrane bound organelles.
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The process that is illustrated is crossing over (B).
Answer choice B.
Negative feedback is when the system is always returning to the same consistant conditions.
A good example of negative feedback would be body temperature (always returns to normal, despite small flunctuations).
Positive feedback always progresses completely. Like growth (once you grow, you stay that way) & pregnancy (fetus is constantly growing and then undergoes childbirth, a forward process).
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