Comparative Anatomy MS-LS4-3

NGSS

A Hollow Ball Of Cells Of An Animal Embryo, It Develops Into A Gastrula.

Blastula

A hollow ball of cells of an animal embryo, it develops into a gastrula. Blastula. The blastula is an early stage in an embryo's development, where cells form a hollow sphere.

A Biological Classification System Based On Evolution From A Shared Ancestral Line.

Cladistics

Cladistics Simple Definition

The Most Recent Individual From Which Two Or More Species Are Descended.

Common Ancestor

The most recent individual from which two or more species are descended. Common ancestor. A common ancestor is an ancient organism that gave rise to different species through evolution.

When A Male Reproductive Cell (sperm) Joins With A Female Reproductive Cell (egg).

Fertilization

Fertilization Simple Definition

A Similar Structure In Different Species, Like A Whale Fin, Bat Wing And Your Arm.

Homologous Structure

Homologous Structure Simple Definition

A Structure That Was Useful To An Ancestor But Is No Longer Functional, Like The Appendix.

Vestigial Structure

Vestigial Structure Simple Definition

The Cell Formed When A Sperm Fertilizes An Egg.

Zygote

Zygote Simple Definition