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structure in animal cells thought to form the spindle fibres during cell division.
the blood vessel that carries blood from the liver to the inferior vena cava.
animal wastes (particularly urine) that contain materials high in nitrogen.
a diploid reproductive stage in the life cycle of many fungi and protists.
two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to...
the loss of water from the land to the atmosphere by evaporation from land and water surfaces,...