What might explain how 20,000 genes encode for 87,000 proteins in human cells? Select one:
a. proteins must be spliced together to be functional
b. genes are cut into proteins by RNA
c. viruses leave behind remnant DNA
d. alternative splicing of genes into different mRNA
e. one gene encodes for one protein

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

not always but somethings can be reproduced in a laboratory.