Examlex
A covariate is a ________ independent variable used in ________.
Twig
A small, slender branch of a tree or shrub, often representing the growth of the current or previous year.
Xylem
Tissue in plants responsible for the transport of water and nutrients from the roots to the leaves and stems.
Cell Layer
A single or multiple layers of cells forming a barrier or a structured component in an organism.
Secondary Xylem
The part of a plant's xylem that is produced after the first growth season, providing additional support and water transport.
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