When is the earth closest to the sun? when it is summer in the northern hemisphere during the vernal equinox when it is winter in the northern hemisphere during the autumnal equinox

Covalent bonds are formed between metals and boiling points true or false

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

The production of cells during mitosis into specialized function is recombination or differentiation