The Period When Major Systems, Organs, and Structures Are Formed

question 216

Multiple Choice

The period when major systems, organs, and structures are formed is called the period of the

• A) ovum.
• B) fetus.
• C) embryo.
• D) zygote.

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Definitions:

Granite

A coarse-grained igneous rock composed mainly of quartz and feldspar.

Stromatolites

Layered structures formed by the growth of microbial mats, often found in fossil form and considered some of the oldest evidence of life on Earth.

Microscopic Creatures

Tiny organisms that can only be seen with the aid of a microscope, including bacteria, protozoa, and some fungi and algae.

Correlate

The process of establishing a relationship or connection between two or more variables, often used in scientific research to determine causal links or patterns.