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tester [92]
3 years ago
9

What are the two subdivisions of the Precambrian Era called?

Biology
2 answers:
Irina-Kira [14]3 years ago
6 0
Archean and Proterozonic which are both broken into early middle and late periods
erik [133]3 years ago
5 0

Answer:

Two major subdivisions of the Precambrian era are Archean and Proterozoic.

Explanation:

The whole period of earth before the formation of the oldest rocks is known as the Precambrian period. It comprises all geological time before 600 million years ago. The two major subdivisions of the Precambrian period are-

1. Archean - It is an older subdivision of the Precambrian period prior to 2500 million years ago. It can be divided into early, middle and late.

Most abundant fossils are found during this period. In this period microfossils of photosynthesizing bacteria known are found.

2. Proterozoic- It is the second major subdivision of the Precambrian period prior to 600 million years ago up to 2500 million years ago. Traces of the Edicara fauna, bacteria, and blue-green algae and first oxygen dependent life-form are found in the Proterozoic period.

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Describe two specialized cells in the respiratory system that enable the lungs to function?
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5 0
3 years ago
What is the genotype of a heterozygous person with a cleft chin?
antiseptic1488 [7]

Answer:

Cc

Explanation:

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A cleft chin is generally thought to be a dominant trait. That means, if an individual carries one copy of the cleft chin gene (heterozygous), then they will display the trait.

There are three options: an individual can be homozygous dominant (CC), homozygous recessive (cc) or heterozygous (Cc). A heterozygous person will always have 2 different alleles (for any trait, not just cleft chin). In this case, a heterozygous person will have a cleft chin, because it is dominant. Therefore, an heterozygous person with a cleft chin will be Cc

Remember, the letter doesn't matter - they could also be denoted as Bb, Qq, Rr, Ff. The letter is arbitrary.

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3 years ago
Fossil records suggest major changes in early vascular plants that favored the evolution of land plants. Which was one of these
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