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(also called a glacial age) a long period of low temperature on Earth, during which large sheets...
the actions of the body's immune system that work to fight infections or disease.
the parts and processes of the body that recognise and fight pathogens, such as viruses and...
when the body makes its own antibodies when deliberately exposed to a dead or weakened pathogen...
drugs that are used to suppress the immune system to prevent tissue rejection.
chisel-shaped teeth found at the front of the mammalian jaw, used to bite and cut off pieces of...
the factor in an investigation that is under the control of the investigator.
a species that helps scientists identify the age of sedimentary rocks.
produced, growing, living, or occurring naturally in a particular region or environment.