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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).
the factor in an investigation that is under the control of the investigator.
(also called selectively permeable membrane) a membrane which allows some substances to cross it...
vascular tissue that conducts food substances from the leaves to other parts of the plant. The...
the practice and science of classification. This is the part of systematics that is only...
a reproductive structure in fungi that is a bit like a seed. But unlike a seed, it can be...