2 poin In 1847 a scientist noted that when physicians washed their hands before
they had contact with their patients, there was a decreased number of
infections. This was one of the first clues that... *
bacteria are present in water
bacteria generate spontaneously on hands
substances such as bacteria may cause diseases
O physicians deliberately infected patients

i would say d

explanation:

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation:

radon is correct hope this

segmented body, an exoskeleton made from chitin, and joint appendages.