a substance, usually a liquid, in which other substances can dissolve.
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Type: Glossary
group of similar organisms that can breed with each other to produce fertile offspring. It is...
Type: Glossary
all the different living organisms on the Earth from the smallest micro-organisms to the largest...
Type: Glossary
a ring of muscle that controls the passage of substances through a tube or body opening.
Type: Glossary
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
Type: Glossary
the instrument that measures the volume of air entering and leaving the lungs.
Type: Glossary
a reproductive structure in fungi that is a bit like a seed. But unlike a seed, it can be...