In the 19th century, biologists began
taking a closer look at
both animal and plant
tissues; perfecting
cell theory. Scientists
could readily tell that
plants were
completely made up
of cells due to their
cell wall. However,
this was not so
obvious for animal
cells, which lack a
cell wall. Many
scientists believed
that animals were
made of "globules."
Which idea is BEST supported by
this paragraph?

What was photo 51 with rosalind franklin?

The part of the eye that closes and opens to let light in is .

Cancer cells spread to other parts of the body by entering the bloodstream. which of the following organs could prevent a cancer cell in the bloodstream from spreading, and why? a. the spleen, because it releases lymphocytes into the blood b. the peyer's patches, because they release lymphocytes into the blood c. the lymph nodes, because they release lymph into the blood d. the thymus, because it releases lymph into the blood