Question

What does stage 1 of embryonic development tell us about organisms?

a. The stage when organisms are most vulnerable
b. The stage of rapid growth and cell division
c. The stage when organisms develop distinct features
d. The stage when organisms first interact with their environment

Answer 1

Stage 1 of embryonic development is characterized by rapid growth and cell division, leading to the formation of three distinct germ layers that later develop into the body's tissues and organs.

Step-by-step explanation:

Stage 1 of embryonic development, also known as the germinal stage, begins with fertilization and concludes with the implantation of the blastocyst in the uterus. During this stage, which lasts until the eighth week after fertilization, rapid growth and cell division occur, leading to the formation of the three germ layers: the endoderm, ectoderm, and mesoderm. Each of these layers will eventually develop into different tissues and organs in a process called organogenesis.

Significant developments also include gastrulation and neurulation. While many organisms, such as mammals, experience a determinate form of development, in which the embryo progresses to a juvenile and then to an adult, others like plants and fungi show indeterminate development, where they can retain embryonic features throughout their lifespan allowing continuous growth.