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regions or bundles of vascular tissue consisting of xylem and phloem separated by cambium.
the body system concerned with the digestion and absorption of nutrients.
the effect of the relative lengths of daylight and darkness on the physiology and behaviour of...
a ring of muscle that controls the passage of substances through a tube or body opening.
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...