Which of the following methods are incorporated to make landfills safer for the general public?

a
Installing a plastic liner under the landfill
b
Placing a large layer of clay beneath the landfill
c
Using a leachate collection system
d
All the above

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.