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Between 5, 4.4 to 3.8 million years ago...it's hard to place a starting line since it's like trying to tell when slowly changing grey color becomes white or black.

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15y ago

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What is a cro probe?

probe is a physical device used to connect an electronics test equipment to the device under test. i.e. connecting an electronic device to cro for testing with help of long wire which is attached with an bananna,lugs tips to cro end and crocodile clips on other end.


How long ago did the modern human species evolve?

This theoretical question has highly differing answers. Some archaeologists may argue that the modern human species evolved around 2.3 million years ago, while others believe differently.


Why did the human beings evolve into standing in an upright position not in the horizontal way?

To need arms to function as efficiently as humans do. To evolve horizontally would require support from four (or maybe three) limbs, and evolving a third set of limbs to serve as arms in very unlikely in a mammal. I don't think a six-limbed mammal exists...


How long have humans been on Earth according to creationism?

According to creationism, humans have been on Earth for approximately 6,000 to 10,000 years. This timeline is based on the belief that the Earth was created by a divine being in six days as described in religious texts like the Bible.


Why did human not evolve to breath nitrogen?

The ability to use oxygen in a biological organism evolved long before humans. That does not answer the question, but life on earth would have had to evolve in a totally different way to use nitrogen. Oxygen is a much more reactive element with other elements releasing energy when it reacts, nitrogen is practically an inert element requiring large amounts of energy be added to make it react. Oxygen is so reactive that it was a poison to early living things when the cyanobacteria started releasing it into the atmosphere about 3 billion years ago. Remaining living things to which oxygen is a poison are called anaerobic organisms. The living things that depend on oxygen are called aerobic organisms. Even aerobic organisms that depend on oxygen find its extreme reactivity toxic in many ways and had to evolve complex ways to counter this toxicity, but the tradeoff of much more available energy than anaerobes can get, makes it worth the extra cost of countering the toxicity. The creationist answer to your question is simply that is just the way God created them. Don't argue, he's God and knows what is best.