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an organic compound that always contains the elements carbon, hydrogen, oxygen and nitrogen and is made up of building blocks (monomers) called amino acids.
microscopes that do not rely on light to produce images. They are used to study the internal...
an organism that helps to spread a disease, but is not infected with the disease.
membrane-bound compartments inside chloroplasts and cyanobacteria. They are the site of the...
a connected network of vessels and glands, which carry lymph throughout the body.