<span>The answer is D. Natural selection is not a process that is part of modern laboratory genetics. The term natural means the absence of human intervention and manipulation. Natural selection is defined as the process wherein organisms adapt to their environment to ensure the survival of their species. </span>
Meiosis involves crossing over where chromosomes exchange genetic segments, resulting in different sets of chromosomes. Each time an egg or sperm created, it is different due to this recombination. Mitosis on the other hand is non-sex cells replicating exact copies of themselves which lead to no genetic variation as they aren't involved in producing offspring.
Answer:
The answer is vestigial.
Explanation:
First, the phylogenetic relationship between the two groups must be clear. As long as they're related, it's possible to believe that the lost or diminished structures in the second group are vestigial. This is very common among many species and can be helpful to identify or hypothesize about the phylogenetic history of one species.
The series of hormonal events that leads to birth:
- Fetal cortisol stimulates the placenta to secrete estrogen.
- The high estrogen level stimulates the uterus to form oxytocin receptors.
- Prostaglandins dilate the cervix, and with oxytocin, increase the strength of uterine contractions.
- Oxytocin stimulates the placenta to secrete prostaglandins.
<h3>What hormones are involved during parturition?</h3>
The female hormones contains in parturition include:
- Estrogen: This plays a main role in uterine contractions.
- Oxytocin: It helps in the uterine contractions during parturition.
- Relaxin
Thus, the series of hormonal events that leads to birth is 2,4,3,1.
To learn more about oxytocin receptors click here:
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