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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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Genotype of parents:                  Ss     x     ss

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The actual ratio in this problem is Eight kittens have short hair and 3 have long hair: 8 : 3

Explanation:

In cats the allele for short hair is dominant over the allele for long hair. (SS or Ss for short hair; ss for long hair).

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For the parents to have been able to produce long haired offsprings, it means both parents possess one copy each of the recessive traits. Thus we have

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Genotype of parents:                  Ss     x     ss

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