Prokaryotes are single-celled organisms that lack a nucleus, and bacteria and archaebacteria are prokaryotes. Given these facts, bacteria and archaebacteria examples of what among the following options: - grass - multi-celled organisms - seeds - Something that causes allergies - major threat to health - single-celled organisms - microorganisms - Food poisoning
single-celled organisms

Burning wood is used to produce heat, and heating and air conditioning keep the building comfortable regardless of the temperature outside. Given these facts, burning wood is used to keep buildings what among the following options: - comfortable - closed - homogenous - warmth - smokey - cold - staying warm - freezing
comfortable

Q: Ablack hole is formed by a high-mass star collapses, and black holes are considered to be spheres. Given these facts, what does a high-mass star collapsing form among the following options: - forces - a sphere - a cube - a circle - dangerous - an object - comets - nucleus
A: a sphere

Question: Biomass is the total mass of organisms at a trophic level, and fourty percent of biomass is carbon. Given these facts, what is fourty percent of the total mass of organisms at a trophic level among the following options: - Energy. - carbon - pan - glucose - matter - Energy - fungi - food
Answer: carbon

*Question*
Neurons are the structural and functional units of the nervous system, and excitotoxicity kills some neurons. Given these facts, excitotoxicity can do what to the structural units of the nervous system among the following options: - harm - loss - duplicate - kill - mutate - death - function - damage
**Answer**
kill

Q: Skin is used for breathing air by frogs, and frogs breathe and absorb water through their skin, which is periodically shed. Given these facts, how do frogs absorb oxygen among the following options: - They drink water - flow of electrons - Jumping really high - during the day - By breathing through their nose - matter vibrating - Through their skin - circulatory systems
A: Through their skin