The tropic of cancer and the arctic circle are examples of locations determined by:

Astronomy.

Explanation:

Astronomy.

Astronomy is science of stars and cosmos. It is a natural science that analyses the objects and events of celestial bodies.  To demonstrate their genesis and evolution, this uses maths, physics, and chemistry. Planets, moons, stars, nebulae, galaxies, and comets are of interest.

The Tropic of Cancer is the latitude circle 23.5 degrees north,whereas the Arctic and Antarctic Circles at ±66.5 degrees latitude.

emerald ash borer

the emerald ash borer is a green buprestid or jewel beetle native to north-eastern asia that feeds on ash species. females lay eggs in bark crevices on ash trees, and larvae feed underneath the bark of ash trees to emerge as adults in one to two years. hope this !

the answer will be a) proteins i believe