Ice Crystals

question 34

Multiple Choice

Ice crystals

• A) never occur in clouds.
• B) usually are found in low-altitude clouds.
• C) usually occur in high-altitude clouds.
• D) occur equally often in clouds at all altitudes.

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Definitions:

Nucleus

The central part of an atom containing protons and neutrons or the control center of a cell containing the cell's DNA.

Chromosomes

Thread-like structures located inside the nucleus of animal and plant cells, made of protein and a single molecule of deoxyribonucleic acid (DNA).

Axons

Long, slender projections of nerve cells that transmit electrical impulses away from the neuron's body.

Dendrites

Extensions of a neuron that receive signals from other neurons and transmit them towards the cell body.