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Dmitry [639]
3 years ago
14

Which of the following large-scale environmental catastrophes has the least effect on aquatic ecosystems?

Biology
2 answers:
WITCHER [35]3 years ago
6 0
B would be the answer for this
JulsSmile [24]3 years ago
3 0
B.
Deforestation affects ecosystems on land. there are no forests underwater

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The cause of the phases of the moon is a cycle that is close to how long
AnnZ [28]

Answer:

The lunar phases gradually change over the period of a synodic month (about 29.53 days), as the orbital positions of the Moon around Earth and of Earth around the Sun shift. The Moon's rotation is tidally locked by Earth's gravity; therefore, most of the same lunar side always faces Earth.

Explanation:

7 0
3 years ago
Which characteristics or structures from the list are found in plant cells? Select all that apply.
Vlad1618 [11]

Answer:

nucleus,chloroplast,cell wall, cell membrane

Explanation:

6 0
3 years ago
Many different types of mutations can occur within the body. An individual experiences a mutation that changes a base
Georgia [21]

Answer:

The type of mutation responsible for changing a base in the mRNA strand, without changing the coding aminoacid or protein, is called a <u>silent</u> mutation.

Explanation:

In a silent mutation occurs the change of a nitrogenous base in one of the codons that encodes an aminoacid, without changing the aminoacid or altering the structure or function of the protein to be synthesized.

In this type of mutations the change of the base does not mean the change of the aminoacid, because some aminoacids can be coded with more than one codon. In the case of Leucine, the codons that encode it are CUU, CUC, CUG or CUA, so even if a base changes, the final protein will be the correct one.

For the other options:

  • <u><em>Missense</em></u><em>: the change of the base in the DNA chain implies the change of the codon in the mRNA and of the encoded aminoacid, in that way a structural and functional alteration of the synthesized protein occurs. </em>
  • <u><em>Nonsense</em></u><em>: the change in the nitrogenous base in the DNA leads to the coding of a termination codon, so that the protein is ultimately incomplete.</em>
  • <u><em>Insertion</em></u><em>: in this case there is the addition of more nitrogenous bases to the DNA chain, with respect to the original one.</em>
3 0
3 years ago
Read 2 more answers
How would the molecule cross the membrane?
Deffense [45]
What molecule??
I'm assuming the answer would be by diffusion.
4 0
3 years ago
Which statements about salt water are true? Check all that apply.
faltersainse [42]

Answer:

a, c, d, e

Explanation:

just answered it.

3 0
3 years ago
Read 2 more answers
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