In humans, birthweight can be represented by a typical bell curve. Babies of low weight lose heat more quickly (surface to volume ratio) and get ill from infectious disease more easily, whereas babies of large body weight are more difficult to deliver through the pelvis. Which type of selection would most likely occur?

Stabilizing natural selection

Explanation:

Stabilizing selection is a natural selective force which stabilizes the population mean based on favorable well adapted phenotypes and will discard non-extreme phenotypes to develop within a population. This results in over-representation of a specific trait which is the intermediate trait and under-representation or avoidance of extreme traits.

The human birthweight curve is bell-shaped due to this stabilizing selection. Infant's survival rate is based on its birthweight.

A low birthweight baby will have lesser surface to volume ratio will lose more body heat and are more prone to infections.

Similarly babies with large bodyweight will have difficulties passing through the birth canal and pelvis during delivery face difficulties to survive and may require incubator conditions to survive or Caesarian section to deliver, all of which affect the survival rate of the infant.

A baby with moderate or medium weight (peak in the bell curve) will have the highest survival rate rather than the low or high (base extremes of bell curve) birthweight babies.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.