How is "food" produced in ecosystems without sunlight?
question 14 options:

a. by chemosynthesis

b. by photosynthesis

c. by phytoplankton

d. by autosynthesis

What is the relationship of air masses and the temperature of oceans?

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.