Which one of the following features is closely related with the evolution of humans?[2000]a)Loss of tailb)Shortening of jawsc)Binocular visiond)Flat nailsCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Because humans have tailbone (coccyx) which is present during 14 - 22 stages of embryogenesis. This serves as an evidence of a tail lost during the course of evolution.                        Hope this helps

Answer

In humans,tail is present in the early embryo but with the passage of time,it disappears.... presence of tail in the early embryo  and then it's disappearance describes evolution of man...

Answer

But I think this may not be the answer bcoz humans close relatives gorilla and gibbon didn't have tail. So from the initial time itself starting  from the development itself we don't posses tail but these ancestors had a prominent jaw which gradually got reduced during evolution so I think B  must be the answer.

Answer

Loss of tail

The correct answer is option 'A', loss of tail. The evolution of humans is characterized by various anatomical and physiological changes that have occurred over millions of years. One of these significant changes is the loss of the tail, which is closely related to the evolution of humans.

Importance of the tail in other animals
The tail is a structure found in many animals, including mammals, reptiles, and birds. It serves various purposes depending on the species, such as balance, communication, locomotion, defense, and grasping objects. In some animals, the tail is prehensile, meaning it can be used to hold or manipulate objects.

Loss of tail in humans
Humans, however, do not possess a tail. Our closest living relatives, the primates, also lack a tail. The loss of the tail in humans is believed to be a result of evolutionary changes over time.

Evolutionary advantage
The loss of the tail in humans can be attributed to several factors that have provided evolutionary advantages. These include:

1. Bipedalism: Humans are unique among primates in their ability to walk upright on two legs, known as bipedalism. The loss of the tail is thought to have facilitated this mode of locomotion, enabling our ancestors to free their hands for tool use and other activities.

2. Reduction in muscle mass: The tail is composed of muscles, tendons, and bones. The loss of the tail in humans has resulted in a reduction in the associated musculature. This reduction in muscle mass has allowed for energy savings and redirected resources towards other structures and functions.

3. Enhanced brain development: The loss of the tail is believed to be associated with the expansion and development of the human brain. As humans evolved, the brain size increased, leading to complex cognitive abilities. The loss of the tail may have allowed for the redirection of resources towards brain development.

4. Changes in reproductive behavior: The loss of the tail may have also influenced changes in reproductive behavior. In many animals, the tail plays a role in courtship displays and sexual selection. However, in humans, other physical and behavioral traits have taken on these roles.

In conclusion, the loss of the tail in humans is closely related to our evolutionary history. It has provided advantages such as bipedalism, energy savings, enhanced brain development, and changes in reproductive behavior. These changes have contributed to the unique anatomical and physiological characteristics of humans.

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