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alukav5142 [94]
3 years ago
10

When does primary succession occur?

Biology
1 answer:
Alexxx [7]3 years ago
8 0
D. is your correct answer

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Cetaceans are whales and their relatives. The diagram shows some fossils of cetaceans.
alexgriva [62]

Answer:

i think it's "C"

Explanation:

because if both have similar structure then just have some relation

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People continue to have strong opinions triggering ongoing debates about stem cell research. Organize the points as either the p
JulsSmile [24]

Answer:

<u>Pro:</u>

May hold answers to cure various diseases including Alzheimer's and Parkinson's - these may be answers to various diseases that are not able to cure.

Requires a small number of cells because of the fast replication rate - these are able to produce a high amount of cells in the lab as they are able to replicate faster.

Medical benefits such as regenerating organ tissue and therapeutic cell cloning

<u>cons:</u>

ethical controversy over use of stem cells from lab fertilized human egg - there is an ethical controversy around the use of lab fertilized human egg

unproven treatments often come with high rejection rates - these researches provide uncertain results and not tested and easily affected so the rate of rejection is high

The cost can be prohibited for many patients - these require high cost and can not be in the budget of every patient.

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What is weathering and erosion
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Once the rock has been weakened and broken up by weathering it is ready for erosion. Erosion happens when rocks and sediments are picked up and moved to another place by ice, water, wind or gravity. Mechanical weathering physically breaks up rock. One example is called frost action or frost shattering.
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