Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
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Explanation:
- One of the main differences between adult and fetal circulation is <em>the direction and where the non-oxygenated and oxygenated blood circulates</em>. In adults arteries carry oxygenated blood away from the heart and veins carry non-oxygenated blood towards the heart; in fetuses, arteries carry non-oxygenated blood away from the heart and veins carry oxygenated blood back to the heart.
- Another difference is <em>where does the exchange of gases takes place</em>, in fetuses blood is oxygenated in the placenta, in adults in the lungs.
- The circulation between adults and fetuses differs in <em>where does the pressure increases</em>, in adults is on the left side of the heart, in fetuses on the right side.
- Finally,<em> another important difference between adults and fetuses is the presence of shunts</em>, in fetuses these shunts allow both sides of the heart to work parallelly letting mix blood from both ventricles. This shunt gets closed after birth, so adults do not have them.
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Answer:
I hope I can help im so sorry I'm so busy so I can't help thanks for the points tho ✌
The result of a cross between two agouti mice of genotype nnaa are albino offspring because mice with genotype nn are albino (pigment production is blocked by epistasis).
<h3>What is epistasis?</h3>
Epistasis is a genetic phenomenon where the presence of a gene variant alters a phenotype influenced by other genes.
A gene is epistatic when a variant (allele) can alter the expression of another gene in the same signaling pathway.
Epistatic interactions are very common in nature and many traits are influenced by this type of interaction.
Learn more about epistasis here:
brainly.com/question/25217589
Answer:
Option B, Biology requires that humans eat a certain amount each day, but culture teaches us what we want to eat, when we want it, and how to eat it.
Explanation:
As per biology, all living individuals require energy for doing their day to day activities and also to survive. This energy is obtained through food. Food provides essential nutrients and minerals and energy to the body that helps the body to survive, grow and develop.
Now a culture defines what to eat and how to eat for instance in some culture only vegetarian food is allowed and in some both vegetarian and non-vegetarian food is allowed for consumption.
Also the timing of eating are defined by the preachers of the culture.
Hence, option B is correct
