One advantage of variation in a species population is that individuals

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The two normal types of sex chromosomes are

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In the transverse of a dicot sperm, the region lying between the endodermis and the vascular bundle is the

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The mammalian vein which starts with and ends in a capillary network is the

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Which of the following produces both hormones and enzymes

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Water is necessary for a germinating seed because it

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The formation of water in the tissue respiration results from the

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In rabbit the chamber of the heart that receives oxygenated blood from the lungs is the

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A unique characteristics of the cervical vertebrate is the presence of

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The organ situated in the pericardia cavity of a mammal is the

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One basic similarity between nervous and endocrine system is that they both

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An increase in air pressure in the lungs is due to the

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