Which of the following statements are correct regarding antibiotics? i. These are chemicals produced by microbes ii. These are substances produced by our body in response to antigens iii. They block the biochemical pathway of the microbes iv. They play significant role in body's immune system A. ii, and iv. B. i. and iii. C. Ü. and iii. D. i. and iv

Ascientist is studying muscle twitches in chicken quadriceps. to activate the muscle, he needs to provide stimulus to the

Aplant may open end close its stomata to prevent excess water loss and maintain

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit