(Q).
If energy is used to keep animals warm, then what keeps animals warm? Answer choices: - Oak - fur - proteins - food - trees - cellulose - Weight - energy
(A).
energy

(Q).
If radioactive isotopes are commonly used to determine fossil age, then radioactive isotopes are commonly used to do what to the age of fossils? Answer choices: - duplicate itself - observe it - debate them - Temperature - Time and energy - determine them - remove them - assign them
(A).
determine them

(Q).
If jellyfish lack a backbone, then what lacks a backbone? Answer choices: - fossil fuels - Chlorophyll - humans - Leptospirosis - fungi - spine - jellyfish - animals
(A).
jellyfish