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Klio2033 [76]
3 years ago
9

The model stating that organic molecules present in ancient seas lead to the formation of life’s building blocks was the.... 1.b

ubble model. 2.primordial soup model. 3.spontaneous origin model. 4.none of the above
Biology
1 answer:
pychu [463]3 years ago
8 0
The answer is (2.) primordial soup model.
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What is the US Census Bureau requirement for a place to be classified as urban?
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2 years ago
When vesicles of the cardiac sarcoplasmic reticulum (CSR) are incubated with ATP Mg^2+ and Ca^2+, they take up Ca^2+ and reach a
abruzzese [7]

Answer

I added 4 and 5 as an attachment due to time constraint.

Explanation:

1. at a steady state ca2+ taken by vesicle = 40n/mol

enclosed volume of CSR = 5μ/mg

concentration of ca2+ in vesicle =

40*10⁻⁶/5x10⁻⁶

= 0.008

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2. radius of circle =75nM

volume = 150nm

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= 1.33 x 3.14 x (75x10⁻⁹)³

= 1.77 x 10⁻²¹

when we convert this we get

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surface area =4x3.14x(75x10⁻⁹)²

= 12.56x5.625⁻¹⁵

= 7.065x10⁻¹⁴m²

this is 7.065x10⁻¹⁰cm²

3. number of vesicle/CSR

= 5x10⁻⁶/1.77x10⁻¹⁸

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8 0
3 years ago
PLEASE HELP Soil erosion due to rainfall is an example of interactions between the geosphere and
nekit [7.7K]

Answer:

D hydrosphere

Explanation:

Soil erosion is the removal  of the top soil layer. Soil erosion is controlled by precipitation (e.g. rainfall) and wind action. Continuous water flow on soil surface supports microorganisms to perform biogeochemical cycles. The phenonmenon is primarlity controlled governed at the iterface of geosphere (soil) and hydrosphere (water).

On the other hand, atmosphere (layers of gases), biosphere (living organisms), cryosphere (frozen water) are not directly related to soil erosion.

6 0
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Plant is a producer
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Meiosis is...<br> A) preserves chromosome number <br> B) reduces chromosome number
nirvana33 [79]

Answer: B)

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