When the cycle goes around , it keeps us alive because we need food to survive
It is the spinal cord that does it.
If frozen water were less dense than liquid water then it would sink, rather than float. The biggest impact of this would of course be in bodies of water where the frozen ice would rest at the bottom of lakes, rivers, etc. rather than floating on the top.This would be devastating to the life in these bodies of water who would not be able to survive in these conditions. There is also the fact that if ice sunk to the bottom, it would take longer to thaw completely, meaning that much of the water sources found in climates that experience a period of coldness would never thaw completely. It would be devastating to the existing ecosystems.
Heidelbergensis is believed to have evolved from African H. erectus, also known as Homo ergaster, during the first early hominin advancements out of Africa, which are thought to have started around 2 million years ago. The one's who migrated through Europe and remained in Africa either speciated into H. heidelbergensis or underwent evolution.
Regional variations in Homo heidelbergensis eventually led to the emergence of two species of humans. Homo heidelbergensis populations in Europe gave rise to Homo neanderthalensis (the Neanderthals), whereas Homo heidelbergensis populations in Africa gave rise to our own species, Homo sapiens.
To learn more click on link below
brainly.com/question/10580074
#SPJ4