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Biology Biology Difficulty: Medium

Oxygen is the production of____________?

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Spermatozoa are formed in: Virus was discovered by Consider the following statements and choose the correct answer: 1. Sieve cells are present in all groups of plants 2. Transverse position of end walls of sieve tubes is a primitive feature whereas their oblique or inclined position is an advanced condition 3. Restriction of sieve areas on the end wall is a primitive condition whereas their presence on end wall as well as radial wall is an advanced condition 4. The sieve plates with larger sieve pores are advanced These are rods or filament like very small bodies present in the cytoplasm of all cells of plants and animals. Highly intelligent Mammals are_________?