Difference between synaptic and spiking activity

What is the difference between how ionic and covalent bonds form

Recombinant dna is the merging of dna from unrelated organisms to create new genetic varieties is assembled in the lab from mononucleotides was part of the green revolution of the 1960s is pollination of one plant by another of the same species is cross-pollination of one plant by a different species

Blank is a rock with a find dark texture that makes up the oceanic crust