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bearhunter [10]
3 years ago
5

Select the correct statement about current hypotheses for the cause of the Cambrian explosion.

Biology
1 answer:
Pachacha [2.7K]3 years ago
6 0

Answer:

A. Oxygen levels reached a critical threshold at the start of the Cambrian explosion, making the evolution of big, mobile animals possible.

Explanation:

The Cambrian explosion was an event that happened approximately 541 million years ago and it lasted for about 13 – 25 million years.

The current hypothesis for the cause of the Cambrian explosion is that oxygen levels reached a critical threshold at the start of the Cambrian explosion, making the evolution of big, mobile animals possible.

Option A. is correct.

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DNA replication occurs prior to meiosis and _________.
Evgesh-ka [11]
A. Mitosis is the correct answer.

DNA replication occurs in the two major types of cell division: mitosis and meiosis.

Mitosis is the splitting of a normal cell into two daughter cells and involves complete replication of the cells DNA to produce two identical copies. Meiosis is a specialised and more complex two-stage form of cellular division related to sex cells and involves DNA replication followed by an exchange of DNA material within/between the chromosomes to mix genes from both parents and produce daughter cells with half the number of chromosomes as the original parent cell. Animal sperms and eggs are examples of cells produced by meiosis and contain half the number of chromosomes as normal cells. When combined during fertilization the egg and sperm produce a cell with the full compliment of chromosomes.

Cytokinesis is a part of the cellular life cycle that is related specifically to the division of the cytoplasm (basically the "soup" of material inside the cell). It is part of the cellular division process but not specifically related to nuclear division (i.e. DNA replication).

Transcription relates to the production of RNA from DNA which is then used for protein synthesis. DNA is not replicated during the transcription process, rather, this is a separate process critical for the production of proteins by the cell.
6 0
3 years ago
PLEASE HELP EXAM IN PROGRESS
Butoxors [25]

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7 0
2 years ago
FILL IN THE BLANK. The Principle of ______ states that the 2 alleles present at each gene locus separate from one another during
BaLLatris [955]

The Principle of <u>segregation</u> states that the 2 alleles present at each gene locus separate from one another during gamete formation and remain distinct.

What is principle of segregation?

According to the principle of segregation theory, every human has two alleles for each specific feature and functions, and these alleles separate throughout the development of gametes. In other words, in everycase, each gamete contains a single allele.

Therefore, The Principle of <u>segregation</u> states that the 2 alleles present at each gene locus separate from one another during gamete formation and remain distinct.

To learn more about principle of segregation

Here: brainly.com/question/2161501

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7 0
1 year ago
Which rock is classified as an evaporite?
snow_lady [41]
I’m pretty sure the answer is 4.
Evaporites are rocks formed by the evaporation of water. They are sedimentary rocks. Common examples of evaporites include gypsum, anhydrite, and halite (common salt.) I hope this helps! :)
8 0
3 years ago
Read 2 more answers
What is traslocation​
stira [4]

Answer:

The exchange of chromosome segment between non-homologous chromosomes is called translocation.

It is of two types:

  • Reciprocal translocation

There is an exchange of chromosome segments between two non- homologous chromosomes in reciprocal translocation.

  • Non- reciprocal translocation

A part of chromosome is translocated from one non-homologous chromosomes to other so that one chromosome becomes deficient and another non-homologous chromosome gains the piece of chromosome and becomes long.

Hope this helps...

Good luck on your assignment..

3 0
3 years ago
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