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Inga [223]
4 years ago
10

The first estimate of the age of our planet was that of:

Biology
1 answer:
Blizzard [7]4 years ago
8 0
It was from darwin  he was the 1
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Identify and briefly describe three (3) of the main contributors to ground water pollution.
Marina CMI [18]

Answer:

Water pollution may be defined as the contamination of the unwanted substance or pollutant with water that changes the normal characteristics of water. Three main contributors of ground water are as follows:

Chemical farming: The use of pesticides and fertilizers in the fields and its direct run off in river and groundwater causes the water pollution.

Industrial waste: The industrial waste consists of harmful chemicals and heavy metals. The direct discharge of chemical waste in the lakes, ground water and ponds makes the water dirty and causes water pollution.

Effluent from waste water treatment plant: The effluent and the harmful chemical waste release from the waste water treatment plant is the major contributor to the ground water. The effluents mix with the ground water and changes the ground water property.

7 0
3 years ago
During the cell cycle, the cell replicates dna. This step occurs.
allochka39001 [22]
DNA is replicated during the “S” phase (synthesis).
5 0
2 years ago
Why have improvements in microscopes over time resulted in revisions in the cell theory?
lord [1]
We have been able to see more of the cell in detail. We dont have to guess about things because we can see how it works. The more we see the more theories change because we know more.
4 0
3 years ago
What second messenger most directly causes calcium ions to be released from intracellular stores?
NemiM [27]

Answer: adenylyl cyclase inositol triphosphate mainly known as IP3 causes the release of Calcium ions directly from the inracellular stores and causea contraction.

Explanation:

IP3, inositol phosphate is a second messenger a signaling molecule. It is made by hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2), a phospholipid that is located in the plasma membrane, by an enzyme phospholipase C.

IP3 binds to the calcium channels and opens Ca2+ channels that are embedded in the ER membrane, releasing Ca2+ into the cytosol. Calcium ions released may cause contraction and regulate the Ca2+ channels in the membranes.

6 0
3 years ago
Within a limited area, if the population of a predator increases, the population of its prey is likely to
Len [333]

The prey is likely to decrease/decline if the predator's population increases

7 0
4 years ago
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