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reproductive or sex cells that contain the haploid set of chromosomes. The male gametes are called spermatozoa or sperm cells, and the female gametes are called egg cells or ova (singular: ovum).
all the ecosystems on the Earth, all the species within these ecosystems and the genetic...
the first part of the intestine, from the pyloric valve of the stomach to the caecum. It...
a system of veins which carries blood from the digestive tract to the liver.