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Stacks of thylakoid membranes, found in a chloroplast

The number of times a cell divides before undergoing apoptosis.

Disorderly, often accidental cell death

The role a species plays in an ecosystem

Square frame used for sampling in field work

Characteristic in which the allele responsible is only expressed in the phenotype if there is no dominant allele present

Cell formed, during sexual reproduction, from the fusion of two gametes

An excretory product formed from the breakdown of excess amino acids