Dating on the primitive meteorites that have been collected show that they are around 4.6 billion years old
1. chondrite
2. radiocarbon
3. carbon
4. stones

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explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.