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saw5 [17]
3 years ago
14

Why is primary production and animal life concentrated at the surface in pelagic regions of the open-ocean?

Biology
1 answer:
konstantin123 [22]3 years ago
7 0
Photosynthesising primary producers require sunlight. Therefore, in the ocean, phytoplankton would be concentrated within the surface layers of the ocean where the sunlight penetrates. Phytoplankton support a wide range of marine life: zooplankton feed on phytoplankton, which in turn support fish and so on. 
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This is the elliptical orbit of the Earth around the Sun. It takes 365.26 days to complete one orbit.
Strike441 [17]

Answer:

Complete orbit around the Sun takes about 365.26 days. The Earth’s rotation axis is tilted relative to the imaginary space orbit around the Sun.  This imaginary plane is called the ecliptic plane.  Position of northern and southern hemisphere toward the Sun varies depending on the season

Explanation:

6 0
2 years ago
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Which dna sugar phosphate bases connect with each other
mafiozo [28]

​Phosphate Backbone is teh dna sugar phosphate bases connect with each other.

8 0
3 years ago
When Mendel performed his experiments, only one trait appeared in the F1 generation, (in this case, round peas) and the other tr
bearhunter [10]

Answer:

See the answer below

Explanation:

The explanation I would give to the phenomenon is that<u> the round trait in peas completely covers or nullify the wrinkled trait when they are together.</u> In order words, <u>whenever a single the allele of both trait come together to form a new trait, the round trait allele dominates and mask the expression of the allele of the wrinkled trait</u>.

<em>This is what Mendel explained and dominance/recessive effects. The round trait was dominant over the wrinkled trait while the wrinkled trait was said to be recessive and can only be expressed when alone.</em>

3 0
2 years ago
If a vertically oriented root is suddenly rotated to be horizontal, auxin transport will change such that there will be ________
sergejj [24]

The question is incomplete as it does not have the options which are:

A. More; more; gravitropism

B. More; less; phototropism

C. Less; more; gravitropism

D. Less; less; phototropism

Answer:

B. More; less; phototropism

Explanation:

Auxin is a hormone which is involved in the plant growth and the development by increasing the flexibility of the cell wall of the plant.

In the given question, the vertical root is rotated to the horizontal orientation which will be sensed by the roots and the roots will then redistribute the auxin in the roots.

The auxin will be transported to the lower areas but the growth of the root in the lower portion will be lowered as a result of which root will grow downward. This is considered a condition called positive gravitropism or negative phototropism.

Since the distribution of auxin is dependent on the presence or absence of light therefore this phenomenon will be referred to as the phototropism.

Thus, Option-B is correct.

4 0
3 years ago
At the time of the origin of LUCA which mode of nutrition was NOT being used?
Vinvika [58]

Answer:

C. Photoautotrophs-oxygenic.

Explanation:

LUCA is an abbreviation of the ‘Last Universal Common Ancestor’. The LUCA was a microorganism which lived around 4 billion years ago. The evidence had shown that the LUCA was lived deep underground in hydrothermal vents. These vents were rich in iron-sulphur. It did not use air but made its food from the metal-rich environment surrounding it. It made organic compounds such as ammonia for its metabolism from elements such as hydrogen, carbon dioxide and nitrogen.

6 0
3 years ago
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