Which of the following organisms have existed on Earth for the longest period of time? O single-celled organisms
O multicellular organisms
O dinosaurs
O mammals

single-celled organisms

Explanation:

cyanobacteria.. single celled organisms

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation