Q: In mammals, the cells on the exterior form the trophectoderm, which goes on to form what? Choices: - protoplanetary tissues - aeroponics tissues - cardiac tissues - extraembryonic tissues A:
extraembryonic tissues

Q: What is the force that slows down or stops motion? Choices: - resistance - tension - thrust - friction A:
friction

Q: What can radioactive strontium replace in the human body making it dangerous? Choices: - potassium - oxygen - magnesium - calcium A:
calcium

Q: The mass percentage of a solution component is defined as the ratio of the component's mass to ________? Choices: - enough ' s mass - solvent's mass - liquid's mass - solution ' s mass A:
solution ' s mass