Q: You are presented with the question "What can be used to remove harmful substances from water?" and the following answer choices: - chlorine bleach - Heat energy - evaporation - oxygen - helium - Electrical energy - hydrogen - Calcium carbonate Now knowing that treating water is used to remove harmful substances before drinking and chlorine bleach is ideal for treating water, choose the best answer.
A: chlorine bleach

Q: You are presented with the question "_ carry signals that control sexual development and reproduction." and the following answer choices: - photons - sex hormones - nerves - Most plants - organs - orchids - animals - insects Now knowing that sex hormones are chemical messengers that control sexual development and reproduction and chemical messengers carry signals from one nerve branch to another, choose the best answer.
A: sex hormones

Q: You are presented with the question "What does operating an automobile usually require?" and the following answer choices: - bus - bicycle - Animal remains - hydrogen and oxygen - energy usage - ramp - Time and energy - solid, liquid, gas Now knowing that operating an automobile usually requires fossil fuels and fossil Fuels Fuels that are formed in the earth from plant or animal remains, choose the best answer.
A: Animal remains

Q: You are presented with the question "Damaged DNA might benefit from:" and the following answer choices: - resistance - cellular repair - mutagens - UV rays - recovery - radiation - Electrical energy - flow of electrons Now knowing that cells have multiple repair mechanisms to fix mutations in DNA and and if the damaged DNA is duplicated, it causes mutation, choose the best answer.
A: cellular repair