science SC 2004 help (1 Viewer)

[supre]

hi everyone,
i need help with question 64 part B , question 66 (full) and question 67 (full)

http://www.boardofstudies.nsw.edu.au/schoolcertificate/sc2004/pdf_doc/science_sctest_04.pdf

thanks in advance

 

[silence--]

66.

a) metal

b) (i) acid could get in your eyes

(ii) safety goggles to prevent acid getting in your eyes

c) increase in temperature, bubbling of the acid, formation of new substances, possible colour change, release of hydrogen gas among other things.

67.

a) There is a variation in the characteristics of any given species. Organisms with favourable characteristics live to reproduce. Even though most of the bacteria were killed, those that survived were able to reproduce, thus creating a species that is able to survive antibiotics, hence natural selection

b) Mutations alter the characteristics of a species. They dont have to be bad and sometimes they can give beneficial traits that can alter a species chance for survival.


For the other thing you could just ramble on about how burning coal contributes to greenhouse, idk.