What attraction holds the nitrogenous bases together within the double helix? a
deoxyribonucleic acid
b
ribose sugar
c
hydrogen bonds
d
phosphate

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

so whats the answer

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.