The documentary focuses on how homo sapiens were able to adapt to multiple environments in various locations without becoming extinct. They had incredible features to withstand harsh climates and tough living conditions and eventually pass their genes to future generations. Our earliest ancestors lived in hot, dry climates in Africa while later on, others lived in isolated freezing temperatures up to -40 ℉. Moreover, certain groups of homo sapiens adapted to live in dry lands with little access to water while others lived by the ocean and depended on sea animals for survival. Homo sapiens acquired valuable skills to allow the creation of sophisticated tools for hunting and consumption of nutrient rich foods, which together expanded the capacities of the brain. Over time, human brains expanded and become capable of performing more complex tasks. The findings of Lucy show how much smaller our brains were when the species first appeared. Paleontologists and archaeologists from around the world have found groundbreaking evidence through fossils and genetic DNA sequencing to find that there are overlapping similarities between the different groups such as Denisovans, Neanderthals, and Homo Sapiens.
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More specific
"They had incredible features to withstand harsh climates and tough living conditions"
You bring up that they had particular characteristics that allowed them to adapt to the various environments you describe, but you don't provide any examples. Maybe list a few to better support the point you're making.
Suggestion
"homo sapiens" should be in italics 'Homo sapien"
You should of mentioned who
You should of mentioned who "Lucy" was and where she was found.