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ziro4ka [17]
3 years ago
8

Scientists believe that the Earth's early atmosphere lacked __________ gas because photosynthetic organisms did not yet exist

Biology
2 answers:
SSSSS [86.1K]3 years ago
5 0
Scientists believe that the Earth's early atmosphere lacked oxygen because photosynthetic organisms did not yet exist. Hope this helps and have a great day!
oksian1 [2.3K]3 years ago
5 0

The right answer is C. Oxygen

During photosynthesis, there is consumption of carbon dioxide and water to produce glucose and dioxygen. Glucose is the "fuel" of its growth. Cellular respiration will consume some of this glucose and oxygen to form oxygen and water.

So, if the atmosphere was lacking oxygen, it's simply because there was no photosynthesis producing oxygen.

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Because you need energy.

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When you eat carbs before any event that consists of running or any other activities, the carbs will fuel you up. Carbohydrates give you energy for a long period of time.

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What would be the correct notation for describing a deletion in the short arm of chromosome 6 at region 2, band 4
Andrej [43]

The correct notation would be Del(6)(p24). The word 'del' means deletion.

<h3>What is chromosome notation?</h3>

Chromosome notation refers to alphanumeric notations used to identify certain chromosome arrangements.

In this case, chromosome notation denotes a deletion (del) in the short arm (p arm) of chromosome 6.

The stained band of the chromosomes in the karyotype is denoted by the number 24.

Learn more about karyotypes here:

brainly.com/question/1327739

5 0
2 years ago
On topographic maps, how does the spacing of contour lines relate to continental and ocean-floor topography? A. For both contine
Trava [24]

For both continental and ocean-floor topography, gentler slopes are represented by widely spaced lines while steeper slopes are represented by closely spaced lines.

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The contour lines are one of the main, and one of the most used methods on the maps for representing the topography. Basically, the contour lines are closed lines that connect dots on the same elevation. It may sound very simple, but they do provide good insight into the topography, especially if the reader of the map knows how to interpret them well.

The contour lines are used both for continental and ocean-floor topography. The rules are the same for both, including the representation of the slopes. When a slope is gentler, the contour lines are more widely spaced. When a slope is steeper, the contour lines are much more closely spaced.

Some elements of the contour lines or that go with them to give better representation are:

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Learn more about contour lines brainly.com/question/1972242

#learnwithBrainly

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