(Question)
All life relies on a relatively narrow range of pH, or acidity, and life during most of the Precambrian was restricted to bacteria and algae. Given these facts, bacteria relies on a relatively narrow range of what among the following options: - RNA - Fe - 12 - DDT - DNA - pH - CO2 - O2
(Answer)
pH

(Question)
Testosterone stimulates the reproductive organs to develop into male organs, and testicles are male reproductive organs. Given these facts, what hormone stimulates the development of testicles among the following options: - oestrogen - progesterone - positive - Testosterone - FSH - stamina - sweating - epidermal
(Answer)
Testosterone

(Question)
Fire converts chemical energy into light and heat energy, and fire is a natural energy source which provides heat, light and energy. Given these facts, what does fire provide among the following options: - warmth - fuel - light - water - ice - air - oxygen - cells
(Answer)
light