What is the difference between divergent and convergent evolution?
Convergent Evolution vs. Whereas convergent evolution involves unrelated species that develop similar characteristics over time, divergent evolution involves species with a common ancestor that change to become increasingly different over time.
What are the three types of evolutionary homologies?
Homology is the study of likeness, the similarity between species that results from inheritance of traits from a common ancestor. The study of similarities is broken up into three main categories: structural, developmental, and molecular homology.
Is analogous convergent or divergent?
Analogous structures arise from convergent evolution, but homologous structures do not. Convergent evolution is the opposite of divergent evolution, in which related species evolve different traits.
Are bat wings analogous to bee wings?
A great example of analogous structures are a bat’s wing and a bee’s wing. Bats and bees do not share common ancestry, so the structures cannot be homologous. Both bat wings and bee wings serve a common purpose – helping bats and bees fly! The structures look similar on the outside, too.
What’s the difference between homologous and analogous structures?
Homologous structures share a similar embryonic origin. Analogous organs have a similar function. For example, the bones in a whale’s front flipper are homologous to the bones in the human arm. These structures are not analogous.
What can homologies reveal about evolution?
Homologous structures provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features). Similarities and differences among biological molecules (e.g., in the DNA sequence of genes) can be used to determine species’ relatedness.
What is the most important piece of evidence for evolution?
Perhaps the most persuasive fossil evidence for evolution is the consistency of the sequence of fossils from early to recent. Nowhere on Earth do we find, for example, mammals in Devonian (the age of fishes) strata, or human fossils coexisting with dinosaur remains.
What color was the first person on earth?
From about 1.2 million years ago to less than 100,000 years ago, archaic humans, including archaic Homo sapiens, were dark-skinned.
Who is the oldest historical figure?
Guinness World Records says the oldest living person verified by original proof of birth is Misao Okawa, a 115-year-old Japanese woman. The oldest verified age was 122 years and 164 days: Jeanne Calment of France, who died in 1997.
What is the oldest record of human history?
roughly 5,000 years
What were humans doing 10000 years ago?
In the Paleolithic period (roughly 2.5 million years ago to 10,000 B.C.), early humans lived in caves or simple huts or tepees and were hunters and gatherers. They used basic stone and bone tools, as well as crude stone axes, for hunting birds and wild animals.
What happened 5000 BC?
Chinese civilisation advanced in this millennium with the beginnings of three noted cultures from around 5000 BC. Also about 5000 BC, the Hemudu culture began in eastern China with cultivation of rice, and the Majiabang culture was established on the Yangtze estuary near modern Shanghai, lasting until c. 3300 BC.
What happened 7500 years ago?
7,500 years ago (5500 BC): Copper smelting in evidence in Pločnik and other locations. 7,200–6,000 years ago: 5200–4000 BC:Għar Dalam phase on Malta. 6,000 years ago (4000 BC): Civilizations develop in the Mesopotamia/Fertile Crescent region (around the location of modern-day Iraq).
What was the world like in 8000 BC?
8000 BC that agriculture developed throughout the Americas, especially in modern Mexico. There were numerous New World crops, as they are now termed, and domestication began with the potato and the cucurbita (squash) about this time.
What was life like 20000 years ago?
20,000 YEARS AGO. Last Glacial Maximum- a time, around 20,000 years ago, when much of the Earth was covered in ice. The average global temperature may have been as much as 10 degrees Celsius colder than that of today. The Earth has a long history of cycles between warming and cooling.