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Rus_ich [418]
2 years ago
5

mr. and mrs. zuhl were professional fossil collectors why my not they have collected precambrian fossils

Biology
1 answer:
Reptile [31]2 years ago
5 0
The precambrian era makes up about 90% of the earths history, but there was little to no living organisms at the time other than microscopic ones. The first eukaryotes were found in the cambrian period after the precambrian period, not only that but at the end of the precambrian era in the Proterozoic era there was a mass extinction of about 70-80% of all living organisms

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Answer:

Tertiary.

Explanation:

Primary structure of proteins refers to the order of amino acids that make up the protein. The heme is an nonprotein non-amino acid, so it is not involved at this stage.

Tertiary structure of proteins is the overall 3-D folding of the protein (it comes after secondary, which involves folding into a repeated pattern). The heme bonds to its correct position on the hemoglobin during this stage and helps in correct folding.

3 0
3 years ago
What gas made up the largest portion of earth's atmosphere for most of earth's history
kipiarov [429]

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So therefore Oxygen is the gas that makes up the largest portion of the Earths Atmosphere.

7 0
3 years ago
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5 0
2 years ago
The smallest muscle of the sural region is the ________ muscle.
algol13
The smallest muscle of the sural region is the <span>plantaris</span> muscle.
5 0
3 years ago
A pharmaceutical company claimed that experiments showed that its drug could effectively reduce the growth of cancer cells by 35
Mazyrski [523]
<span>The labs were unable to reproduce the pharmaceutical company’s data

An important characteristic of scientific experiments is that their results can be replicated. In this case, assuming that the laboratories followed the same procedure as the pharmaceutical company, the fact that the data could not be replicated means that the company's claims are invalid. The validity of the claims is more questionable given the huge difference in the final conclusions, with the company reporting a 35% decrease, while the maximum decrease observed by the labs was 8%.
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8 0
3 years ago
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