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Travka [436]
2 years ago
14

Please help I don't understand.

Biology
2 answers:
cupoosta [38]2 years ago
7 0

Answer:

False .

atmosphere in early earth was filled with both methane and ammonia

Now days we have nitrogen, oxygen Carbon dioxide and variable gases

Softa [21]2 years ago
5 0

Answer:

False, because the atmosphere is not composed completely of these two gases. Ammonia and methane now make up little to none of the atmosphere.

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Cardiovascular features unique to the Fetus:

Fetal circulation is characterized by low systemic vascular resistance (SVR) with high systemic blood flow and high pulmonary vascular resistance with low pulmonary blood flow.

<h3>What is fetal circulation?</h3>

The embryonic circulatory system directs blood that needs oxygen through three shunts, or microscopic tunnels. These shunts are intended to avoid forming organs like the liver and lungs while the fetus is still in the womb.

The foramen ovale, which carries blood from the right atrium of the heart to the left atrium, and the ductus arteriosus, which takes blood from the pulmonary artery to the aorta, are the two shunts that bypass the lungs.

Through the placenta, the mother's blood supplies the fetus with nutrition and oxygen. The enhanced blood divides into three branches as it travels via the umbilical cord to the liver.

Learn more about fetal circulation with the help of the given link:

brainly.com/question/7191531

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Alina [70]

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the main function of Krebs cycle is that it plays a big role in the process of energy production and biosynthesis.

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Why is it thought that the majority of natural selection is stabilizing selection? Mutations produce extreme phenotypes, which are selected for. Artificial selection is the most common, which is a type of stabilizing selection. Most mutations are beneficial and produce intermediate phenotypes.

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