This case of mistaken identity called imprinting. The best-known form of imprinting is filial imprinting, in
which a young animal acquires several of its behavioral characteristics from
its parent. It is most obvious in nidifugous birds, which imprint on their
parents and then follow them around.
Answer:
If humans were still hunting and gathering food instead of farming - taken into account that the entire population hunts and gathers food in the context of this question - the majority of people would have dark-skin complexions.
Explanation:
This is easily explained by a hunter-gatherer's way of living. Before humans learned to raise animals and grow crops, the majority of us were hunters and gatherers. Hunters and gatherers lived, and still continues to live, their lives very differently from how we are living at present. They'd spend hours hunting - as their name suggests - and catching food out in the wild, which exposes them to a higher amount of sunlight than our everyday way of living. To cope with this, evolution also played an important part in determining the survival of these people in the scorching sun - they evolved to producing high amounts of melanin. Melanin is a dark pigment that helps protect our skin cells against the harmful UV rays from the sun. Lighter skinned people have less melanin than darker skinned people, and when that extra melanin is produced, you'd see it as a tan. Hunter-gatherers produced high amounts of melanin, primarily because they had adapted to spending a large fraction of their time out in the open. The melanin acts like a built-in sunscreen for them, protecting them from getting skin cancers like melanoma.
Marine mammals , with few exception are viviparous.
Explanation:
- Mammals are those animals which are characterized by the presence of mammary gland and body hair.
- They feed milk to their young ones.
- The vertebrates are classified as viviparous, oviparous and ovoviviparous depending on the way their young ones develop and are nourished during their embryonic and foetal development.
- Viviparous animals are those which directly give birth to their young ones and have a distinct gestation period during which their babues develop inside their womb. These are placental mammals.
- Oviparous animals are those which lay egg and the embryo develops outside mothers body.
- Ovoviviparous animals are those who do not lay their eggs but their eggs hatch inside their body .These are aplacental animals.
- Most mammals are viviparous.
