The part of the atom with a positive change is the question 4 options: electron shell proton electron neutron

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

the answer to your question is tooth decay.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.