A Physical Barrier That Separates a Population in Half and That

question 75

Multiple Choice

A physical barrier that separates a population in half and that leads to the evolution of a new species is called

• A) sympatric speciation.
• B) allopatric speciation.
• C) directional selection.
• D) ecological isolation.
• E) behavioral isolation.

---

Definitions:

Prolactin

A hormone produced by the pituitary gland that plays a vital role in lactation, allowing mothers to produce milk.

Testosterone

A steroid hormone primarily produced in males by the testicles and in smaller amounts in females by the ovaries, playing key roles in health and development.

Natural Level

An inherent or fundamental state or degree of something that is not influenced by external factors.

Ovaries

Female reproductive organs that produce eggs and hormones like estrogen and progesterone.