By the End of the Fourth Gestational Week, the Embryo

question 20

Multiple Choice

By the end of the fourth gestational week, the embryo is __________ long, the head is apparent, and the eyes, nose, mouth, and ears begin to form.

• A)¼ inch long
• B)½ inch long
• C)4 inches long
• D)12 inches long

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Definitions:

Conifers

A group of cone-bearing seed plants with vascular tissue, mostly evergreens, that includes pines, spruces, and firs.

Gymnosperms

A group of seed-producing plants that includes conifers, cycads, ginkgos, and gnetophytes, characterized by seeds that are not enclosed in an ovary.

Animal-pollinated

Refers to plants that rely on animals, such as bees, birds, and bats, to transfer pollen from one flower to another for fertilization.

Inconspicuous Flowers

Flowers that are not easily noticeable or visible, often due to their small size, dull color, or lack of showy petals.