Need help!!! asap due in a hour

Biology

1 answer:

iris [78.8K]3 years ago

5 0

You got all of them right if you need help with fourth one I can’t see it

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During the twentieth century,what was added to the relative time scale

liubo4ka [24]

During the twentieth century, absolute date was added to the relative time scale. Geologic time scale uses both relative and absolute dating techniques. Soon after the discovery of radioactivity, geologists used radioactive isotope decay to develop a method for determining absolute ages of rocks

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3 years ago

1. What type of succession takes place that increases the biological diversity of an ecosystem? For example, if we started with

professor190 [17]

There are two types of succession that lead to the increasment of the ecosystem:

1. Primary succession is the change in the structure of an ecosystem represented with the increase of the ecological community on an area that has not been previously occupied by an ecological community such as area after the lava flow or glacial lake. The first organisms of primary succession are pioneer plants usually, lichens and mosses.

2. Secondary succession includes the step of removal of pre-existing community and after that, colonization of the new one.

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3 years ago

Can someone help please

vivado [14]

I think the answer is A.

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3 years ago

Which two pieces of equipment did the geologist most likely use to determine the density of the copper nuggets?

zhuklara [117]

A glass flask and sodium and hydrogen hope it helped

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Which statement provides a possible explanation for the growth

Shtirlitz [24]

Answer:

3) Uncontrolled cell division occurred as a result of gene mutations

Explanation:

Spontaneous modifications within the genome may occur during the process of cell division. When copies of the DNA inside the cell are made, these mutations cause errors; and can include small single nucleotide polymorphisms, and large scale additions or deletions across multiple genes.

Some, like somatic mutations, exist only inside vegetative (body) cells, that cannot be passed onto offspring. This is caused by several factors like

UV radiation,
chemical mutagens,
infective agents

UV radiation damages strands of DNA, by causing dimers to form; here, consecutive nucleotide bases covalently bond instead of those on the complementary strand. This conformational change causes errors in DNA proofreading and repair mechanisms where bases are not well-incorporated into the strand- tumors (clumps of uncontrolled cell growth) may form, resulting in melanoma, a type of skin cancer.

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3 years ago