A) ucaata
b) agtaca
c)ucaagu
d) aguuca

its d)AGUUCA

Explanation:

so were Changing the letters dna to rna which they are complementary I believe.. so in rna t(thymine)goes with a(adenine) c(cytosine) goes with g(guanine) but in this case t changes to u that is uracil so in rna a goes with u that is uracil so..

T=A

C=G

A=U

A=U

G=C

T=A

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation:

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.