Sand forms when rocks break down from weathering and eroding over thousands and even millions of years.
And anyways everything decays it might take 1 to millions of years but everything decays.
The reason for why they wanted to come is:
-they were looking for new land, new resources that they wouldn't have to compere for with other humans and which would be potentially better
The reason why they could cross the sea from Asia to America is that the sea was either frozen over or more shallow (because it was frozen in other places) - which made the crossing easier.
Answer:A. he held this would allow the population to thin itself out naturally
Explanation:
Thomas Malthus's theory was concerned with the rate of population growth. He the established the Malthusian theory of population growth which states that population growth occurs exponentially, whilst the production of food increases linearly. Exponentially means it increases faster and faster especially as birth rates also increases. Linear increase of food production means it goes through stages and can only increase at a given point.
As a resulf of this , it likely that population will grow up to a point where the available resources are less than the population itself , it will out grow the resources.
So he looked at want can be done to reduce this potential effect of poulation growth and he determined types of checks.
Preventive checks things are things that people can do voluntarily such as delaying getting married in which he supported moral restraint as a religious person himself.
He also determined positive checks which may help shorten the lifespan such as disease,famine ,warfare and poor living. So to him these catastrophic events may assist in reducing the increase of population by shortening the life span, naturally decreasing the population.
Breast tenderness would be considered a presumptive sign of pregnancy.
The fertilization of sperm and ovum occurs at ampulla isthmic junction of fallopian tube. This ovum travels to the uterus and joins with the uterus for further development. Two weeks after the fertilization or conception, pregnancy is said to begin.
This is accompanied with missed periods or menstruation. Other important presumptive signs include nausea, vomiting, breast tiredness, back pain, poor sleep etc. In humans, the pregnancy or gestational period lasts for around 40 weeks or 80 days. Estrogen, progesterone and human chorionic gonadotropin are the three hormones that rise at the start of pregnancy.
Estrogen regulates progesterone and increases blood flow while progesterone prepares the uterus for implantation of fertilized ovum. The third hormones indicates the creation of placenta.
Learn more about presumptive sign of pregnancy -
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The roots of the renaissance plant tells us that the medieval and classical periods and the renaissance are related and one gives rise to another. In this case, the medieval and classical eras existed between the 5th and 15th century. The two periods form the basis of culture and art, where most people painted based on their perception, beliefs and artistic understanding. On the other hand, the renaissance that existed during the 16th century marked the beginning of most things that people see today. It was a period of a peaking society among Europeans. The art was changing into more fashionable designs in clothes, houses, etc. Hence, the roots of the renaissance plant tells as the origin of all arts and culture in the European society throughout the generations.
Here is what I found from an expert, you might want to put this into your own words. :)
