Carbon monoxide is a gas produced by furnaces and other devices that burn fuel, and excessive accumulation build-up of carbon monoxide can cause suffocation. Given these facts, what can gas furnaces cause among the following options: - matter vibrating - Pollution - rain - Stale air - condensation - emissions - suffocation - friction
suffocation

If an object is black then that object absorbs all visible light, and light is made of photons . Given these facts, if an object absorbs all photons then that object among the following options: - is reflective - is black - Energy. - heat energy - inactive - moves - is transparent - is flexible
is black

Q: Echinoderms have a unique water vascular system with tube feet, and echinoderms are represented by the starfish. Given these facts, what kind of animals has a water vascular system with tubed feet among the following options: - animals - starfish - reeds - insects - warm-blooded - sponges - sea coral - four limbs
A: starfish

Question: Weathering means breaking down rocks from larger whole into smaller pieces by weather, and climates with freeze and thaw promote mechanical weathering. Given these facts, what can can break down rocks from larger wholes into smaller pieces among the following options: - Earthworms - sea urchins - Freezing and thawing - Calcium carbonate - Compaction - mechanical - Sedimentation - Cementation
Answer: Freezing and thawing

*Question*
An egg requires warmth to survive, and and humans do come from eggs, eggs without shells, they are called ovum. Given these facts, what do some ovum require to survive among the following options: - sperm - Proteins - glycogen - sugar - hormones - nutrients - warmth - food
**Answer**
warmth

Q: Hormones are chemical messengers that control many body functions, and hormones are a functional class of chemicals. Given these facts, what are hormones among the following options: - it needs them - cells - Plants growth - messengers - positive - infections - kinetic - disease
A: messengers