The spider has a venom in their teeth that they inject into your skin when they bite you so you won’t bleed everywhere and your skin has a reaction to the venom because it’s strong enough to have an effect just not strong enough to hurt you.
True, depending on which isotope. some Isotopes are deemed extremely unstable and cannot be used for nuclear fuel. however, most are usable
The correct answer is the first one: biologists describe the characteristics of life rather than providing a definition. Some of the characteristics include:
growth
reproduction
metabolism (using and transforming energy)
organisation (into multiple cells or within the cell)
So a Child being albino is impossible now if your talking about white people being born then that is a plausible answer but the possibility of that happening is 3.02