Stars Are Made Mostly of

question 21

Multiple Choice

Stars are made mostly of

• A) helium.
• B) oxygen.
• C) hydrogen.
• D) nitrogen.

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Definitions:

Sapwood

The outer, lighter part of a tree trunk that is active in the transport of water and nutrients.

Functional Secondary Xylem

The part of a plant's vascular system that is responsible for water and nutrient transport, developed after the primary growth phase.

Monocot Stem

is the stem found in monocotyledonous plants, characterized by scattered vascular bundles.

Pith

The soft, spongy tissue at the center of plant stems, providing structural support and storing nutrients.