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One advantage of variation in a species population is that individuals
The two normal types of sex chromosomes are
In the transverse of a dicot stem, the region lying between the endodermis and the vascular bundle is the
The mammalian vein which starts with and ends in a capillary network is the
Which of the following produces both hormones and enzymes
Water is necessary for a germinating seed because it
The formation of water in the tissue respiration results from the
In rabbit the chamber of the heart that receives oxygenated blood from the lungs is the
A unique characteristics of the cervical vertebrae is the presence of
The organ situated in the pericardial cavity of a mammal is the
One basic similarity between nervous and endocrine system is that they both
An increase in air pressure in the lungs is due to the
The product of excretion common to the mammalian kidney, lung and skin is
Night-blindness result from a deficiency of