AP BIOLOGY

ANIMAL PHYSIOLOGY

NERVOUS SYSTEM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
After they are born, most mammals
A
can care for themselves.
B
are helpless for a long time.
C
begin to fly within two weeks.
D
reproduce asexually.
Explanation: 

Detailed explanation-1: -Altricial young are born helpless and require care for a length of time. Altricial birds include herons, hawks, woodpeckers, owls, cuckoos and most passerines. Among mammals, marsupials and most rodents are altricial. Domestic cats, dogs, and primates, such as humans, are some of the best-known altricial organisms.

Detailed explanation-2: -Human babies enter the world utterly dependent on caregivers to tend to their every need. Although newborns of other primate species rely on caregivers, too, human infants are especially helpless because their brains are comparatively underdeveloped.

Detailed explanation-3: -Chicks break through their shells and within hours are pecking around for food. Snakes hatch and just slither away. Humans, on the other hand, are completely helpless at birth and remain dependent on their parents for many years.

Detailed explanation-4: -In animals, learned helplessness occurs when an animal is repeatedly subjected to an aversive stimulus that it cannot escape.

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