11. Damaged seeds would on top of water. 12. Cholera is  caused by.

13. Like synthetic fibre , plastic is also a  .

14. Metals react wih acids to produce   gas.

15. The Fire produced by oil cannot be controlled by.

16. Migratory birds fly to far away places because of       changes.

17. cell without well organised nucleus  are called   cells.

18. Time period of a pendulum depends on its .  

19. The size of pupil becomes when you see in dim light.

20. Shrillness of a sound  is determined by the   of vibration please I mark you brainlest its science ​

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Step-by-step explanation:

11-float

12-Water/food

13-polymer

14-hydrogen

15-Water

16-climatic

17-prokaryotic

18-oscillation

19-larger

20-frequency

11.Damaged seeds would float on top of water.

12.Cholera is an acute diarrheal illness caused by infection of the intestine with Vibrio cholerae bacteria. People can get sick when they swallow food or water contaminated with cholera bacteria. The infection is often mild or without symptoms, but can sometimes be severe and life-threatening.-i dunno which one :/

13.Like synthetic fibres, plastic is also a polymer .

14.Metals react with acid to give hydrogen gas and form metal salts.

15.Fire produced by oil cannot be controlled by water.

16.Migratory birds fly to far away places because of climatic changes.

17.prokaryotic cells

18.The period for a simple pendulum does not depend on the mass or the initial anglular displacement, but depends only on the length L of the string and the value of the gravitational field strength g, according to The mpeg movie at left (39.5 kB) shows two pendula, with different lengths.- dunno which one.

19.In dim light, your pupil expands to allow more light to enter your eye. In bright light, it contracts. Your pupil can range in diameter from 1/16 inch (1.5 mm) to more than 1/3 inch (8 mm). Light detected by the retina of your eye is converted to nerve impulses that travel down the optic nerve- dunno too.

20.Shrillness of a sound is determined by the frequency of vibration.

Step-by-step explanation:

Hope it helps! Btw/by the way, just pick or read the 12,18,19 and pick your asnwer

By

I believe it should be 2x+2=7 . Twice the sum means multiplication so that would be 2x. And since we do not know what the number is we represent it as x and it equals to 7 so we set it equal to 7. Hoped that helped!