- Life Sciences
microscopes that do not rely on light to produce images. They are used to study the internal structure of cells and the organelles themselves.
a molecule that is built up of two or more different elements that are chemically joined...
animals with two cellular body wall layers: the ectoderm and endoderm.
structure in animal cells thought to form the spindle fibres during cell division.
the blood circuit from the heart to the body and back to the heart.