Which stars can be smaller than the sun? select all that apply.
a) neutron stars
b)red giant
c)white dwarf
d)main sequence star

The green colored pigment in chloroplasts is? a. nitrogen b. chlorophyll c. chlorophorm d. chlorofloromethane

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

What is the difference between a scientific hypotheses and a scientific theory?