Q: If adult sponges are attached permanently, immobile, then adult sponges are? Answer choices: - warm - immobile - food - parasites - strong - white - fertile - warm-blooded
A: immobile

Q: If freshwater environments have little salt, then what do freshwater environments have little of? Answer choices: - nektar - sand - nitrogen - fungi - salt - Acids - Carbon - water
A: salt

Q: If metals expand when they don't pass all of the heat through themselves to elsewhere, then what is the result of imperfect passing of heat through a metal, on that metal? Answer choices: - contamination - expansion - sweating - Energy. - forces - burning - Evaporation - electricity
A: expansion

Q: If birds secrete estrogen to attract a mate, then what do birds secrete to attract a mate? Answer choices: - Energy. - Energy - fur and fat - seeds - oxygen - pollen - Estrogen - acetic acid
A: Estrogen