Which aquatic ecosystems are composed of salt water? check all that apply.
a. intertidal zones
b. neritic zones
c. open ocean
d. streams
e. coral reefs

Aquatic ecosystems that are composed of salt water are coral reefs, open ocean, and intertidal zones. Neritic zones also have salt water, but the salinity levels are very light. :)

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

allowed for the prediction of the properties of missing elements.