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tino4ka555 [31]
3 years ago
10

What causes the collapse of a nebula?

Biology
1 answer:
Otrada [13]3 years ago
8 0

Answer:

Irregularities in the density of the gas causes a net gravitational force that pulls the gas molecules closer together. Some astronomers think that a gravitational or magnetic disturbance causes the nebula to collapse. As the gases collect, they lose potential energy, which results in an increase in temperature.

Explanation:

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Which characteristic is shared by all arthropods?
natulia [17]

Question: which characteristic is shared by all arthropods?

Answer: all arthropods have exoskeletons

Explanation: because it provides support and protection for all arthropods

question answered by

(jacemorris04)

6 0
2 years ago
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The earliest cells detectable in fossils were different from the cells in animals, plants, fungi, and protists living today. The
aalyn [17]

Answer:

In the 1960s, Lynn Magulis came up with the theory of endosymbiosis. Different evidence supports this theory that the cell organelles like chloroplasts and mitochondria were once utilized by the independent living species. Both of these organelles exhibit their own genetic material. The mitochondria cannot differentiate to produce chloroplasts and vice versa.  

However, the fact that the mitochondria are found in all the cells of eukaryotes, while the chloroplast is witnessed only in certain specific cells, shows that the evolution of mitochondria took place much earlier than the chloroplasts.  

5 0
3 years ago
Over the past 60 years, many amphibian species have experienced significant population declines and some species have become ext
ollegr [7]

Answer:

a bottleneck effect

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Genetic drift refers to the change in the allele frequencies in a population due to chance (random) events. The bottleneck effect, also known as population bottleneck, can be defined as a severe case of genetic drift caused by a drastic reduction in the population size. The bottleneck effect is well known to cause the loss of important genetic variation since alleles that were present in the original population are lost, thereby limiting its genetic diversity. One of the most common causes that may lead to a population bottleneck in a natural population is environmental disasters (e.g., earthquakes, floods, etc).

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3 years ago
The process of moving a body part around a central axis is
Kitty [74]
Answer: The process of moving a body part around a central axis is called rotation

hope this helped!
5 0
2 years ago
QUESTION 20
sdas [7]

Answer:

32

Explanation:

Meiosis always has half of the chromosomes as mitosis. Hope that this helps you and have a great day :)

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