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katrin [286]
3 years ago
5

Which compound was abundant in Precambrian Earth’s oceans, before complex life evolved on Earth?

Biology
2 answers:
rjkz [21]3 years ago
8 0

Answer:

Dissolved carbon dioxide

Explanation:

Just took the test and it was correct

den301095 [7]3 years ago
6 0

Your answer is for your question is B. Dissolved carbon dioxide

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Which carbohydrate(s) are structural compounds?
muminat

Answer:

Carbohydrates are important macromolecules that consist of carbon, hydrogen, and oxygen. They are organic compounds organized in the form of aldehydes or ketones with multiple hydroxyl groups coming off the carbon chain.

Explanation:

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3 years ago
How do I know the phenotype and genotype percentage on a punnet square?
Nesterboy [21]

Answer:

Phenotypes are physical attributes. Genotypes are the alleles.

The phenotypes are 75% green peas and 25% yellow peas. This is because the capital G is a dominant allele and green is the dominant attribute and as long as 1 G is present, then the pea will appear green.

The genotypes are 25% GG, 50% Gg, and 25% gg.

Please thank!

3 0
3 years ago
What would life be like without plate tectonics
emmasim [6.3K]
 It really is impossible to predict such a matter. I mean, think about it, its nearly impossible to think about how earth would be impacted if the heat from the interior of the planet that powers plate tectonics were to suddenly cease to exsist, or if that heat never exsisted in the first place, because that is how planets are formed.
 One thing is certain however, life wouldn't be the same without plate tectonics; in one case, the constont transgression/regression, sue in large part of tectonic forces acts as a evolutionary pump forcing life to evolve. EXAMPLE:  the evolution of plants from marine to terrestrial settings. Without plate tectonics, life would certainly be dramatically different.
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5 0
3 years ago
How does soil erosion damage soil?
inessss [21]

Answer:

Soil erosion affects soil health and productivity by removing the highly fertile topsoil and exposing the remaining soil. It decreases agricultural productivity, degrades ecosystem functions and amplifies hydrogeological risk, such as landslides or floods

Explanation:

4 0
3 years ago
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Identify the location where the sex cells of each reproductive system mature.
Y_Kistochka [10]

The correct answer is <u>D</u> -ovary for the left (female reproductive system) and Q-epididymis for right (male reproductive system).

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Testis are the primary sex organ in males.  Spermatogenesis is process by which sperm is produced in testis. Spermatogenesis starts at the age of puberty due significant increase in the secretion of gonadotropin releasing hormone (GnRH). This, if you recall, is a hypothalamic hormone. Sperms released from the seminiferous tubules, are transported by the accessory ducts. Secretions of epididymis, vas deferens, seminal vesicle and prostate are essential for  maturation and motility of sperms. The seminal plasma along with the sperm constitutes the semen.

6 0
3 years ago
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