If androgens are chemical messengers, then androgens and what kind of messengers? Answer choices: - animals - interact - organ - humans - chemical - PDAs - allow growth - kinetic
chemical

If tuna have a circulatory system with a two-chambered heart, then what has a circulatory system with a two-chambered heart? Answer choices: - salmon - Man - Toyota - Birds - koalas - tuna - sharks - toads
tuna

Q: If support structures of a plant are sometimes used to store water, then where is water sometimes stored in a tree or plant? Answer choices: - stomach - evaporation - support structures - at or near the margins - reservoir - watershed - near the shoreline - lake
A: support structures

Question: If aflame converts chemical energy into light and heat energy, then what converts chemical energy into light and heat energy? Answer choices: - starfish - warmth - a flame - trees - cigarettes - an object - sunlight - engines
Answer: a flame

*Question*
If smoking causes emphysema, then emphysema can be caused by? Answer choices: - Pollution - nitric oxide - smoking - steroids - Pesticides - pollen - hormones - hydrogen peroxide
**Answer**
smoking

(Q).
If global marine ecosystems are found in the ocean's salt water, then where are global marine ecosystems found? Answer choices: - in freshwater ponds - our landscape - in the lakes' freshwater - salt and water. - sub-units of species - colder and wetter - in freshwater streams - in the ocean's salt water
(A).
in the ocean's salt water