Should be A. Species have changed over time.
Answer:
any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties.
Explanation:
Resistor
An electrical component that limits or regulates the flow of electrical current in an electronic circuit
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Answer:
Mikroalga adalah alga mikroskopik, biasanya terdapat di sistem air tawar dan laut. Mereka adalah spesies uniselular yang wujud secara individu, atau dalam rantai atau kumpulan. Bergantung pada spesies, ukurannya boleh berkisar antara beberapa mikrometer (µm) hingga beberapa ratus mikrometer.
Explanation:
