Which of the following is the common to the mosquito, housefly and blackfly?

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The process of shedding the exoskeleton of an arthropod is known as

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The chromosomes of members of the kingdom Monera are within the

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A water medium is necessary for fertilization in

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Which of the following has the most primitive respiratory system?

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Which of the following used diffusion as the principal method of gaseous exchange?

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The waste product of plants used in the conversion of hide to leather is

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The correct sequence of the movement of urea during urine formation is

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Pineapple is an example of

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The pancreas secretes enzymes for the digestion of

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Stunted growth and poor root development are a result of a deficiency in

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The opening and closing of the stoma are regulated by

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