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3 years ago

Help pls

Biology

1 answer:

Rashid [163]3 years ago

6 0

Answer:

5. when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent

6.They are moving toward each other

7. The Nazca Plate is bounded on the west by the Pacific Plate and to the south by the Antarctic Plate through the East Pacific Rise

8.Convection currents in the mantle drive plate tectonics. Convection is the reason for ocean currents. Ocean currents result from two processes - the action of wind on the surface of the water, and from variation in water temperature that causes movement.

Both the mantle and ocean experience the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock; this is called, again, convection.

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2 organelles likely to be found in a human cell

qaws [65]

Answer:

Mitochondria...

Nucleus

are the cell organelles which we can find in human cell

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2 years ago

Please answer the following questions correctly

Oksi-84 [34.3K]

Answer:

i. Name each of the parts labelled I, II, III, IV and V.

{5 marks}

I - Crown / Enamel

II - Dentine

III - Cement / Periodontal membrane

IV - Jaw bone / Root

V - Pulp Cavity

ii What is the function of each of the parts labelled I and III?

{2 marks}

I - Protects teeth from harmful bacteria

-- Enable teeth withstand pressure of chewing

-- Cutting / chewing / protects dentine / protect pulp cavity

III - hold tooth firmly (in socket / Jaw bone)

iii Which of the labelled parts could be affected by tooth decay?

{1 mark}

V - Pulp cavity

iv State three ways by which tooth decay may be prevented.

{3 marks}

→ avoid using sharp-pointed objects

→ avoid having dry mouth

→ use water containing fluorides to wash teeth / mouth

→ avoid smoking

→ the teeth should be cleaned regularly after each meal / remove food particle from the teeth / flossing

→ wash the mouth vigorously after each meal

→ regular visit to the dentist

→ avoid eating too hot foods

→ avoid eating too much sugary food

→ avoid eating too cold food / taking too cold drinks

Explanation:

6 0

2 years ago

Why is a parent usually a better match for transplanted tissue to a donor than a random individual of the same species?

s344n2d4d5 [400]

Answer: For decreased chances of rejection

Explanation:

The three higly polymorphic MHC 1 genes in human beings are HLA-A, HLA-B and HLA-C.

These determine the compatibility of the organ or tissue in the recipient's body each by the help of many alleles that segregates in a population.

There are very less chances that a random chosen donor will match the a recipient six allele genotype.

This is the reason parent may be the best donor for organ transplantation or tissue transplantation.

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3 years ago

Can fatigue seriously impair driving ability.<br> a.no<br> b.yes

NikAS [45]

The correct answer is B.

When your body and mind are fatigued you are out into a field of fuzziness. When dealing with extreme fatigue, there is the obvious problem of falling asleep in the road, which could result in terrible and most likely fatal accidents. But there are also other problems mentally and visually that can occur that would impair your driving ability when facing extreme fatigue.

I hope this helps! :)

5 0

3 years ago

Suppose it were possible to conduct sophisticated microscopic and chemical analyses of microfossils found in 3.5-billion-year-ol

soldier1979 [14.2K]

Answer:

The correct answer is option 3. a nucleus.

Explanation:

The first genetic material present in the early organisms were RNA which was present in the microscopic organisms back then 3.5 billion years ago which means it is normal to have RNA in such microfossils chemical analysis.

Since, the nucleus was not present in early life forms of prokaryotes like bacteria. so, it is unusual to find nucleus in the fossils of stromatolite rocks.

Thus, option III is the correct answer.

7 0

3 years ago