a cell that contains two sets of chromosomes.
plant that lives for one year or season.
responsible, low impact, usually small- scale travel to protected, unspoilt, natural areas and...
a parasite that lives on the outside of its host.
mass extinction event of 65 million years ago, in which about 85% of all species on Earth died...
a complex organic substance needed by the body in small amounts for normal growth and...
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