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labwork [276]
3 years ago
15

Which two types of structures make up the earthworm's heart?

Biology
1 answer:
kondaur [170]3 years ago
5 0

Answer: Option A and B.

Organ system and tissues.

Explanation:

Earthworm is a segmented worm that belong to the phylum annelids. Earthworm has a close circulatory system just as human beings which means their blood circulate through a closed network of vessels which are connective tissues. Earthworm has a structure of 5 hearts and they are called aortic arches which are organ systems. These pump blood into network of vessels and it's flow through the body. From there, the blood move to dorsal blood vessel which send blood to the front of the Earthworm, then to the ventral blood vessel which send blood to the posterior. At the intestines, there are lateral vessels which carry nutrients away from the gut and to the body.

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What is energy? Where does energy come from? Where does electrical power come from? How is it generated? 4. Why do we need energ
ASHA 777 [7]

Answer:

Electricity is a secondary energy source that we get from the conversion of other sources of energy such as coal, natural gas, oil, nuclear power, and so on. These sources are known as “primary sources.” Primary sources can be renewable or non-renewable, but the electricity itself is neither.

Explanation:

thank me later

8 0
3 years ago
Explain how the processes of sea-floor spreading and magnetic reversal produce bands of oceanic crust that have different magnet
WARRIOR [948]

Explanation:

As the two plates move away from each other in a divergent boundary, the magma from the mantle beneath rises to replace the void created. The magma then cools into a new crust. Before the magma cools, the iron minerals align themselves with the magnetic fields of the earth due to their ferromagnetic properties. These cause the rocks after they are cooled to seem to have bands.

Due to magnetic reversals of the earth's magnetic fields (i.e change in magnetic north and south poles) over several hundred thousand years, these bands will orient differently depending on the then earth magnetic polarity when the magma was cooling.

Learn More:

For more on seafloor spreading check out;

brainly.com/question/3616698

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4 0
3 years ago
In colorectal cancer, some tumor suppressor genes are inactive. This is an important factor resulting in uncontrolled cell divis
tresset_1 [31]

Answer/Explanation:

(1) a mutation in the coding region, resulting in an inactive protein

To check to see if there is a mutation, you could extract the DNA from the cancer cells and then perform PCR to amplify the gene of interest. You could then perform sanger sequencing and compare the sequence to the normal gene to see if a mutation is present. To test the effect of the mutation, you would want to see if an active protein has been formed.

To see if a normal sized protein has been formed, you could perform a western blot, comparing the protein band to the WT protein band. If the protein is absent or much smaller, it is likely not a functional protein.

(2) epigenetic silencing at the promoter of the gene, resulting in reduced transcription.

To check for changes in the epigenetic landscape of the promoter, you could perform chromatin immunoprecipitation by extracting the chromatin from the tumour cells and using antibodies for different chromatin marks to see what has changed between the normal cells and the tumor cells. E.g. H3K9me3, H3K27me3. You would perform a pull down with the antibody of interest and then PCR for your promoter to specifically look at changes at that gene compared to normal cells. To test DNA methylation, you could perform bisulfite sequencing.

To see how transcription is affected, you could extract RNA from the tumor and normal cells, and compare the levels of RNA between the two samples by qRT-PCR

3 0
3 years ago
•Address the letter to the editor of a local newspaper.
Julli [10]

The answer is; hydrothermal, geothermal, and wind

Hydrothermal, taped from the biggest river on the state contributes approximately 60% of the energy in the state. Geothermal is second,approximately 30% while wind power contributes approximately 10%.


The costs of the electricity in the state are relatively cheap compared with states whose main source of energy is hydrocarbon fuels.   Geothermal power is the cheapest (even though initial investment is prohibitive). Hydrothermal is slightly expensive than geothermal due to the maintenance required and also  is prone to fluctuations of the river regime. Winds are also cheap but initial investment if the wind farm is high.



Hydrothermal energy has the biggest environmental impact compared to the other two. Due to the walls of the dam on the river, migration of some aquatic species is impeded. The reduced flow of water (and sediments) downstream of the dam also impact these ecosystems. Geothermal and wind energy sources have a very minimal environmental impact on the environment .


The state could increase electronics with low power consumption (such as LED lights) in the market for availability to the population. This would be followed by a sensitization campaign on the ideal use of power in the household to conserve power when not in use.


4 0
3 years ago
What could Carl Linnaeus no have used as a method of classification in his taxonomy system ?
True [87]

Answer:

i dont know thats a hard one

Explanation:

5 0
3 years ago
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