- Life Sciences
an injection of a weakened or dead pathogen into the body to build up immunity against a disease.
the fluid that circulates through the lymphatic system. It is similar to blood plasma in...
an enzyme that catalyses (speeds up) the hydrolysis (breaking) of a chemical bond.
the second biological classification group (taxon) that is divided into phyla (for animals) or...
animals with three cellular body wall layers: the ectoderm, mesoderm and endoderm.