The Pre-Embryonic Period Ends When

question 110

Multiple Choice

The pre-embryonic period ends when

• A) a morula is formed.
• B) the zygote undergoes cleavage.
• C) the blastocyst implants in the uterus.
• D) the morula develops a trophoblast.

---

Definitions:

Evolutionary Processes

The natural mechanisms through which species undergo change over time, involving variations in traits that are heritable and can influence reproductive success.

Female Preference

The tendency or inclination for females within a species to select certain traits or behaviors in mates.

Predators

Organisms that hunt, kill, and consume other organisms for food, playing an essential role in maintaining the balance of ecosystems.

Natural Selection

A fundamental mechanism of evolution, whereby organisms better adapted to their environment tend to survive and produce more offspring.