6. Which of the following is FALSE about the efficiency of machines? a. Machines can be more efficient by reducing friction.
b. Adding oil helps machines slide across each other more easily.
c. Adding more opposing forces helps to reduce friction.
d. Adding grease helps machines slide across each other more easily.

a

Explanation:

because machines require friction in order to work. it wouldnt be efficient by reducing friction

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.