If antigens are molecules that can cause an allergy, then an allergy can be caused by? Answer choices: - antigens - Pesticides - cold weather - fever - viruses - food - Smoking - germs
antigens

If during asexual reproduction the spore enclosures produce heart-shaped gametophytes, then when does spore enclosure produce heart-shaped gametophytes? Answer choices: - The area was once underwater - peachleaf willow - It helps them survive - Asexual reproduction - during the day - by indirect light - allow growth - in the autumn season
Asexual reproduction

Q: If killer whales are a marine species, then what are killer whales? Answer choices: - red and black - They have thick fur - dangerous - sharks - deep sea creatures - marine species - Absorb light - animals
A: marine species

Question: If all liquids cause refraction of light, then what causes the refraction of light? Answer choices: - focusing a lens - Chemical energy - fossil fuels - all liquids - a solute - chemical changes - an electron lens - squids
Answer: all liquids

*Question*
If at least some deuterostomes use pheromones to communicate with each other, then at least some deuterostomes use pheromones to do what? Answer choices: - attack prey - seed dispersal - share properties - deuterostome with each other - not communicate - Release energy - mate with females - communicate with each other
**Answer**
communicate with each other

If organic molecules cycle quickly between organisms and the atmosphere, then what cycle quickly between organisms and the atmosphere? Answer choices: - chlorofluorocarbons - organic molecules - Most plants - Greenhouse gasses - Greenhouse gases - emissions - fossil fuels - Burning fuel and air
organic molecules