Cutting down trees has a negative impact on an ecosystem, and if trees are cut or burned, the carbon is released back into the atmosphere. Given these facts, releasing what can have a negative impact on an ecosystem among the following options: - disease - viruses - A virus - Carbon - tar - toxins - herbicide - vehicles
Carbon

Oxygen is just one substance transported by the blood, and hemoglobin transports oxygen in blood. Given these facts, what is just one substance transported by hemoglobin among the following options: - gas - glucose - proteins - carbon - oxygen - an anion - hair - Energy
oxygen

Q: Marine biomes are found in the salt water of the ocean, and another animal that lives within the Marine Biome is a sea tiger. Given these facts, where is the sea tiger found among the following options: - eroded - ocean - warm - fossils - dense - ligt - embryos - dead
A: ocean

Question: Magnetism can cause objects to repel each other, and drop metal objects such as golf clubs, and backpacks. Given these facts, what can cause golf clubs to repel each other among the following options: - electrically - friction - layers of fat - water - fire - repellant - magnetism - heat energy
Answer: magnetism

*Question*
If an object is black then that object absorbs all visible light, and just next to the visible light spectrum is the infrared spectrum. Given these facts, the infrared spectrum is not absorbed by what objects among the following options: - eyes - PDAs - black - skin - Cars - humans - mines - matter
**Answer**
black

(Question)
Some arthropods have special excretory structures, and all insects are arthropods. Given these facts, what has a special excretory structure among the following options: - Silk plants. - Insects. - a fish - animals - plants - Architecture structures. - barnacles - Corset structure.
(Answer)
Insects.