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mass extinction event of 65 million years ago, in which about 85% of all species on Earth died...
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...
those species that are found only in a particular area or region and nowhere else on Earth.
a ductless gland that secretes hormones directly into the bloodstream, to be transported to...
the inner body tissue layer that forms the gut and other internal organs.
the inner most layer of the cortex of roots and some stems of plants.
the cell organelle responsible for manufacturing and transporting protein and lipids.
the internal supporting framework made of cartilage and/or bone. This type of skeleton occurs in...
dormant, tough and non-reproductive structure that remains dormant until conditions become...