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Vikentia [17]
3 years ago
7

How the size and growth rate of the human population has changed in the last 200 years

Biology
2 answers:
Stels [109]3 years ago
3 0
It changed as more food more games less sleep
Kipish [7]3 years ago
3 0
200 years ago there were less than one billion humans living on earth. Today, according to UN calculations there are over 7 billion of us.1 Recent estimates suggest that today's population size is roughly equivalent to 6.9% of the total number of people ever born.2 This is the most conspicuous fact about world population growth: for thousands of years, the population grew only slowly but in recent centuries, it has jumped dramatically. Between 1900 and 2000, the increase in world population was three times greater than during the entire previous history of humanity—an increase from 1.5 to 6.1 billion in just 100 years.
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Which statement describes an invasive species? OA. It is a native species that has no predators. O B. It is a nonnative species
iren2701 [21]

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B

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marysya [2.9K]

Answer:

According to the diagram, what is occurring in step 7 is cytokinesis, with the separation of two daughter cells, following cell division.

Explanation:

Cytokinesis is a process that occurs at the end of mitosis or meiosis, being the final step of cell division. This mechanism allows the <u>separation of the two daughter cells</u>, with equal distribution of cytoplasm and formation of cell membrane, differentiating into two independent cells.

In the diagram it can be observed (step 7) that after the division process —in yellow— two arrows pointing to two cells are evident, which implies the process of cytokinesis.

Prior to the cytokinesis process, karyokinesis occurs, which is the separation of nuclei and formation of the nuclear membrane.

In animal cells, karyocinesis occurs by the effect of a ring of actin and myosin that helps to force the separation. In the plant cell, the fragmoplast is formed, a septum that induces the separation of the daughter cells.

The other options are not correct because:

  • <u><em>Cell growth</em></u><em> occurs in G1 phase.</em>
  • <u><em>Cell preparation</em></u><em> occurs in interphase.</em>
  • <u><em>DNA replication</em></u><em> occurs in S phase.</em>
  • <u><em>Mitosis</em></u><em> is represented in yellow, and involves 4 phases.</em>

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3 years ago
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