Ejercicios de ciencia

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes