Activity Choose one invasive species not mentioned in this section and research it online. Discuss the threats it poses to
ecosystems and to humans (if any).
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Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

Why do mountaineers become breathless as they reach high altitudes