6. One revolution of Earth around the sun takes one day.
one week.
one month.
one year.

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

What sre the effects of hemolytic disease of a newborn

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