Answer:germinal, embryonic, and fetal
Explanation:
Germinal Stage this is the conception stage when the egg get fertilised by the sperm which occurs in women's fallopian tubes. When the egg is fertilised it is then referred to as a zygote. A zygote will then travel to the uterus which may take a week to get there. In the uterus it's where the single felled zygote will start to multiply cells and grow. It start and last from 0 - 2 weeks.
Embryonic Stage
The multiple cells are known as the embryo. This begins at the third week in which the multiple cells start to actual form something that can now be referred to as a human and not just cells. This is the crucial stage for brain development.
This is where the signal cord also develops.
Fetal stage
When cells have actual be distinct such that it can be visible that this is a human , the embryo now will move to the next stage in which it becomes a fetus. This occurs at the ninth week and until the baby is born.
The development of body system and structure continues and get more established than it was in embroynic stage.
Communism leads to slow economic growth, lack of motivation and less competition between the entrepreneurs.
<h3>What is Communism?</h3>
Communism is the economic theory derived by the Karl Marx which is based upon the class less society in which everyone is equal. It says that the means of the production is owned by the government.
The disadvantages of the communism is that government will be holding the property that means there will be no or less competition between the entrepreneurs. It will lack the free of speech.
The economic growth of the country will slow down leading to the political repression. The countries that followed the approach of the communism is Russia and China.
Learn more about the communism here:
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The researchers present unshelled northern and southern periwinkles to northern and southern crabs in the second experiment to test if either population of periwinkles was unpalatable to either population of crabs.
Answer: Option D
<u>Explanation:</u>
The researchers picked up crabs and periwinkles from the northern and the southern location of Gulf of Maine. Then an individual crab was inserted into hutch companied with 8 size variable periwinkles. Following four set-ups were organized, where crabs involved were of both gender but not size variable and these set-ups were analyzed 12-14 times:
- Northern crab and periwinkles
- Southern crab and periwinkles
- Northern crab and southern periwinkles
- Southern crab and northern periwinkles
After three days of experiment conclusion drawn was: southern crab killed more number of northern periwinkles when compared with rest three set-ups. While second is northern crab and northern periwinkles, third is southern crab and periwinkles and fourth is northern crab and southern periwinkles.
Now, same set-ups as above was organized but with unshelled northern and southern periwinkles and conclusion researchers found that crabs catered themselves with all unshelled periwinkles within 1 hour to test if either periwinkles population was unpalatable to either crabs population.
