Which of the following is a feature of the population pyramid of a developing country?

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An example of a filter -feeding animal is

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The percentage of humus in the soil sample is

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In nature, plants and animals are perpetually engaged in mutualism because

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The type of asexual reproduction that is common to both Paramecium and protists is

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The sequence of the one-way gaseous exchange mechanism in a fish is

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Which of the following organs regulates the levels of water, salts , hydrogen ions and urea in the mammalian blood?

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The vascular tissues in higher plants are responsible for

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The movement response of a cockroach away from a light source can be described as

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The path followed by air as it passes through the lungs in mammals is

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The part of the mammalian ear responsible for the maintenance of balance is the

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The enzyme involved in the hydrolysis is

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