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4 years ago

When did the Devonian period start and end?

2 answers:

4 0

The Devonian Period was part of the better known Paleozoic Period. Some scientist think it was 416 million years ago. It was the time of the great fish. It gets its name from when red rocks from Devon, England were also found in North America. It is believed that during this period parts of North America, Europe, Russia and Greenland crashed together making a new land mass. Scientists believe this period ended about 354 million years ago when land plants began to take over and much of what was an ocean disappeared.

nexus9112 [7]4 years ago

4 0

Silurian period to the beginning of the carboniferous period

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What should the nurse teach parents is the most important influence on the eating habits of early school-aged children? smell an

dem82 [27]

The nurse should teach parents that the most important influence on the eating habits of early school-aged children is the example of parents and siblings at mealtimes. While children may be influenced by some few other factors, they are most likely to be influenced by the example and atmosphere provided by their parents more than any other thing.

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3 years ago

Lionfish are considered invasive species to the Atlantic Ocean off the coast of Georgia and Florida. They have no known predator

ahrayia [7]

Answer: D

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3 years ago

At some point in their life cycle, all cells have a _____, whereas not all cells have a(n) _____.

Shtirlitz [24]

The cell membrane is present during the whole cycle. The nuclear cell breaks and then is regenerated. At some point in their life cycle, all cells have a _cell membrane_, whereas not all cells have a(n) _nuclear cell_.

<h3>What happens to the membrane during cell cycle?</h3>

The cell cycle involves two stages. First occurs the interphase, and after that cell division. During the interphase, the cell prepares for division, duplicating its size, its content, and genetic material.

During the prophase, the nuclear membrane breaks. Cell division occurs (either mitosis or meiosis), and at the end of the cycle, the nuclear membrane regenerates again (during the telophase).

Finally, cytokinesis occurs in which through invagination of the cell membrane, the cell divides into new cells.

The cell membrane is present during the whole cycle, protecting the cell content. The nuclear cell breaks and then is regenerated.

At some point in their life cycle, all cells have a _cell membrane_, whereas not all cells have a(n) _nuclear cell_.

You can learn more about the cell cycle at

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2 years ago

Discuss the influence that population size can have on

Fittoniya [83]

Answer:

When a population is in Hardy-Weinberg equilibrium for a gene, it does not evolve and allelic frequencies will remain the same for generations.

There are five basic Hardy-Weinberg assumptions: there is no mutation, the mating is random, there is no gene flow, the population size is infinite and there is no selection.

If the assumptions are not met for a gene, the population can evolve for that gene (that is, the allelic frequencies of that gene may change).

The mechanisms of evolution are violations of the different Hardy-Weinberg assumptions: mutation, non-random mating, genetic flow, finite population size (gene drift) and natural selection.

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4 years ago

Which of the following animals has a solitary lifestyle ? A.sika deer B.elephant C. zebra D.rhino

Talja [164]

Answer:

A sika deer

my ans is right or wrong

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3 years ago

Read 2 more answers