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the widespread and rapid extinction of species in the present age due to negative human impact on the environment.
special chemical molecules that transmit nerve impulses across a synapse.
reproductive or sex cells that contain the haploid set of chromosomes. The male gametes are...
the remains of digestion, which are eliminated from the body via the anus, and contain...
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
a structure made mostly of glass, in which temperature and humidity can be controlled for the...