A student is investigating how substrate concentration affects the rate of an enzyme-catalyzed reaction. Which three variables should be kept constant in the setup of the student's investigation.

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

What is the genotype of the male circled in pink? ο χου lo xay xaya done answer was xay

Do plant cells perform cellular respiration?