Ned is designing an experiment to test which hand sanitizer kills the most e. coli bacteria. in order for ned's results to be valid, what must he do? a. test each hand sanitizer on different days and at different times of the day b. test the first brand of hand sanitizer on e. coli bacteria, then test the second brand of hand sanitizer on a sterilized petri dish c. test the hand sanitizers first on e. coli bacteria and then on other bacterial species d. test the hand sanitizers on bacterial colonies that are kept in the exact same environmental conditions, such as temperature and light level

the bullets go in this order.

4, 1, 3, 5, 2

if, i suppose that a bee stings me swinging my hand away from a bee. then that if, i persist patient when a bee or wasp areas on your surface to investigate a scent or to take h2o and i secreting heavily, the bug ultimately will move of its personal agreement. if i don't need to set for it to disappear, lightly and gently wipe it off with a part of the paper.

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers