Write the letter representing base that pairs with its complementary nucleotide bases in dna

The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?

The polio virus can cause skeletal muscle paralysis by destroying neuron cell bodies. what area of the spinal cord is destroyed

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.