The body is protected against harmful flu viruses by
(1) red blood cells and hormones
(2) white blood cells and antibodies
(3) white blood cells and enzymes
(4) red blood cells and antibodies

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

What class of levers is shown in this image?

What two factors does carrying capacity compare? population size and resource use population growth and resource availability resource use and time population size and time