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Mazyrski [523]
3 years ago
5

What is speciation?

Biology
2 answers:
Aleksandr-060686 [28]3 years ago
8 0

Answer: The correct answer is -

B.The process by which new species are formed.

Speciation can be described as the process of formation of new species (that are distinct from old species) during the course of evolution of old species.

In other words, when one species gives rise to two or more different species during the course of its evolution, it is termed as speciation.

For example - 13 distinct species of Galapagos finches (bird species), which were formed from single ancestral species due to allopatric speciation (geographical isolation that occured by ocean).

Thus, option B) is the right answer.

statuscvo [17]3 years ago
4 0
B. because specieation is defined as ¨<span>the formation of new and distinct species in the course of evolution.¨</span>
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What part of the intestinal tract prevents backflow of food from the stomach into the esophagus? a. diaphragm b. lower esophagea
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Answer:

The correct option is b. lower esophageal sphincter

Explanation:

The esophagus is the initial part of the digestive tract and its function is the transport of the alimentary bolus from the pharynx to the stomach, through the thorax and avoid the reflux thereof. It begins and ends in two sphincter structures, the upper esophageal sphincter and the lower esophageal sphincter, which separate it from the pharynx and stomach. The lower esophageal sphincter has two functions: relax during swallowing and prevent reflux of the gastric contents into the esophagus in the postdeglutory period. After swallowing, there is a relaxation of the lower esophageal sphincter, pressure dropping to levels similar to those of the gastric fundus, which allows the bolus to enter the stomach. This relaxation lasts a few seconds and is followed by a strong contraction that prevents backflow of food.

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3 years ago
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3 years ago
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\huge\mathfrak {Answer}

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3 years ago
What kind of mutation is demonstrated below:<br> ATGCCATGGCATTGA --&gt; ATGCCATGCATTGA
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Comparing the two sequences, you can see that one G nucleotide is missing in the new sequence compared to the original.

This is a single nucleotide deletion, where one nucleotide is lost from the sequence. Otherwise, the sequence is entirely unchanged.

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