Because Birds Live in Every Climate and Biome,and Because They

question 21

Multiple Choice

Because birds live in every climate and biome,and because they are easy to track and count,they serve as excellent ____.

• A) keystone species
• B) scapegoats
• C) indicator species
• D) aesthetic indicators
• E) habitat determiners

---

Definitions:

Neurotransmitters

Chemical messengers that transmit signals across a chemical synapse, such as a neuromuscular junction, from one neuron to another 'target' neuron, muscle cell, or gland cell.

Central Nervous System

The part of the nervous system consisting of the brain and spinal cord, responsible for processing and sending out signals to the rest of the body.

Neurons

Specialized cells in the nervous system that transmit information to other nerve cells, muscle, or gland cells.

Cell Body

The part of a neuron that contains the nucleus and most of the cytoplasm and where the metabolic work of the cell is done.