Which best describes the structure of a dna molecule?
a. two strands of amino acids linked together

b. two strands of rna linked together
c. a strand of dna linked to a strand of rna
d. two strands of dna linked together

D. Two strands of DNA linked together

Explanation:

nucleotide join together to form a DNA molecule  

can confirm that "two strands of DNA linked together" is correct

Explanation:

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organisms that are both used in toothpaste as well as cause malaria are protista and monera.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.