What would happen if guard cells in a plant stopped working? a. diseases would quickly invade the plant. b. photosynthesis would occur more slowly. c. stomata would not open and close. d. chloroplasts would change color.

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

Based on the evidence in the excerpt above, describe in your own words what it would have been like for a person to enter a meat processing plant in the united states

Asmall number of finches are removed randomly from the wild and placed in a protected bird area. they are given as much food as they need and have plenty of space. why would natural selection not occur in this population? a. there is no reason for genetic mutation to occur. b. the birds compete for limited resources, c. the population has not reached carrying capacity. d. there is no genetic variation in the finches.