Why are female animals bigger than males?

The large sexual size dimorphism is partially due to sexual selection, but also because females reach reproductive age much earlier than males. In addition the males do not provide parental care for the young and allocate more energy to growth.

What is female choice why and when does it occur?

It occurs in internally-fertilizing species and involves differential use of sperm by females when sperm are available in the reproductive tract. The present understanding of cryptic female choice is largely thanks to the extensive research and analysis done by William G. Eberhard.

What are the 10 reasons why humans evolved?

10 Possible Reasons Why Humans Evolved 1. We Could Throw Things 2. Walking Upright One of the major things that set humans apart from our Hominin relatives is the size of our brain. 3. Interbreeding About 60,000 years ago, early Homo sapiens left Africa. When they did, they encountered other

Did humans evolve because our ancestors could throw rocks?

Based on findings at the site, researchers believe that humans evolved because our ancestors could throw rocks. The theory is based on the fact that our ancestor, Homo erectus, survived in the Dmanisi area despite the presence of large cats, like saber-toothed tigers and leopards.

What are the origins of human beings?

The story of human origins is complicated since our ancestors swapped genes (and probably skills). The first humans emerged in Africa around two million years ago, long before the modern humans known as Homo sapiens appeared on the same continent.

What was the first form of sexual reproduction?

The first sexual beings to emerge perhaps 2.5 billion years ago were what biologists call isogamous — which is a little like being gay, except everyone is somewhere between male and female. Many organisms, including some fungi, algae and single-celled pond-swimmers, still practice isogamy.