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3 years ago

What percent have humans activities reduced the earth's forest cover in the last 8000 years

Biology

1 answer:

djyliett [7]3 years ago

8 0

Answer:

Nearly 50%

Explanation:

The earth about 8000 years back was comprised of almost 6 billion hectares of forest-covered land. And according to the research, it has been observed that nearly 50% of the initially forest-covered region has been reduced, which has now become about 3 billion hectares.

These forests are being cut down for various purposes, such as construction of urban areas, construction of wooden houses, making furniture, overgrazing of animals, forest fire. It causes both naturally as well as due to anthropogenic activities.

Thus, nearly 50% of the forest is reduced in the last 8000 years.

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Answer:

77.5lbs

Explanation:

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In cells where telomerase is normally inactive, it can become active by accident and often, cancer will develop as a result. Can

vesna_86 [32]

Answer:

Cancer cells achieve proliferative immortality by activating or upregulating the normally silent human TERT gene (hTERT) that encodes telomerase, a protein with reverse transcriptase activity that complexes with other proteins and a functional RNA (encoded by hTR, also called hTERC) to make a ribonucleoprotein enzyme.

Explanation:

A rare cell that escapes crisis almost universally does so by reactivating telomerase and this cell can now become a cancer cell with limitless potential to divide. Almost all cancer cells have short telomeres and thus inhibitors of telomerase should drive such cancer cells into apoptotic cell death. Yet, each time a cell divides, the telomeres get shorter. When they get too short, the cell no longer can divide and becomes inactive or "senescent" or dies. This process is associated with aging, cancer, and a higher risk of death.

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3 years ago

According to the theory of isotasy which statement must be true

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Prophase of meiosis I has some important differences from prophase of mitosis. These differences include: ___________BLANK pair,

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Complete question:

Prophase of meiosis I has some important differences from prophase of mitosis. These differences include: ___________BLANK pair, and _________BLANK occurs.

A: chromatids; condensation

B.,chromosomes; separation

C. homologous chromosomes; crossing over

D. homologous chromatids; separation

Answer:

C. homologous chromosomes; crossing over

Explanation:

Prophase I of meiosis and prophase of mitosis are quite distinct with respect to the events occurring in the cells. Prophase-I of meiosis is a relatively long stage. The Zygotene stage of prophase-I includes the pairing of homologous chromosomes. This pairing is mediated by synaptonemal complex and the process is called synapsis. The paired chromosomes undergo the process of crossing over during the pachytene stage of prophase-I. In crossing over, the non-sister chromatids of the bivalents exchange some genetic material between them. The events of synapsis and crossing over do not occur during prophase of mitosis.

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