1.
if the sequence on a dna molecule was cctag, the complementary sequence on the mrna would be:

ggauc

ggutc

ggatc

uuatu

GGAUC

Explanation:

C pairs with G

T pairs with A

A pairs with U

G pairs with C

CCTAG -> GGAUC

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.