An enzyme lowers the energy of activation. what does that mean?

Well enzymes are protiens. And the activation energy is what starts the reaction so An enzyme lowers the needed energy to cause it to react! Hope this helps and have a great day!

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

the answer is b.) hydrogen bonds between bases.