Our our body, bones and some other inner body parts are solid but our body also contain liquids( water, blood, acid etc) and gases( air, oxygen, co2 etc). So, our body is look like solid object but it contains multiple states of matter.

Your blood is made up of liquid and solids. The liquid part, called plasma, is made of water, salts, and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells, and platelets. Blood cells constantly die and your body makes new ones.

solids

Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium. All 11 are necessary for life.

ADAM1

Homo habilis

Homo erectus were the first of the hominins to emigrate from Africa, and, from 1.8 to 1.3 million years ago, this species spread through Africa, Asia, and Europe. One population of H. erectus, also sometimes classified as a separate species Homo ergaster, remained in Africa and evolved into Homo sapiens.

On the biggest steps in early human evolution scientists are in agreement. The first human ancestors appeared between five million and seven million years ago, probably when some apelike creatures in Africa began to walk habitually on two legs.

According to calculations by geneticist Graham Coop of the University of California, Davis, you carry genes from fewer than half of your forebears from 11 generations back. Still, all the genes present in today’s human population can be traced to the people alive at the genetic isopoint.

The simplest way to think about it is that every stranger in the world is a cousin of yours, and the only question is how distant a cousin they are. The degree of cousin (first, second, etc.) is just a way of referring to how far you have to go back before you get to a common ancestor.

Humans are one type of several living species of great apes. Humans evolved alongside orangutans, chimpanzees, bonobos, and gorillas. All of these share a common ancestor before about 7 million years ago. Learn more about apes.

New research shows that all blue-eyed people share a common ancestor. This person lived more than 6,000 years ago and carried a genetic mutation that has now spread across the world. All blue-eyed people have one ancestor in common, born around 6,000 to 10,000 years ago. Blue eyes are caused by a gene mutation.

As a result, first-generation inbred individuals are more likely to show physical and health defects, including:

• Reduced fertility both in litter size and sperm viability.
• Increased genetic disorders.
• Fluctuating facial asymmetry.
• Lower birth rate.
• Higher infant mortality and child mortality.
• Smaller adult size.

Lighter eyes, such as blue or green eyes, have less pigment in the iris, which leaves the iris more translucent and lets more light into the eye. This means that light-eyed people tend to have slightly better night vision than dark-eyed people.

8 What the study found was a higher statistical correlation between lighter eye color and alcoholism than between brown eye color and alcoholism, and the correlation was markedly higher for blue eyes.

Eye Color Matters Lighter-colored eyes have less pigment to protect against sun damage and UV radiation compared to darker-colored eyes. This means that people with green, hazel, or blue eyes are more sensitive to light and more susceptible to UV damage.

While men were 1.4 times more likely than women to wish their partner had a different eye color, both genders favored the color blue. Surprisingly, green, brown, and hazel were more preferred on a partner than gray eyes – the color respondents considered the most attractive.

This lack of pigment is the reason that blue-eyed people may be more sensitive to bright light and have a greater need to wear sunglasses than their brown-eyed counterparts. …

People with blue eyes tend to have greater light sensitivity. Night vision is often better among people with blue eyes. A genetic mutation is responsible for blue eyes. People with blue eyes are more likely to have red eye in photos.

The vast majority of people in the world have brown eyes. The second most common color is blue, but people can also have green, gray, amber, or red eyes.

New research shows that people with blue eyes have a single, common ancestor. Scientists have tracked down a genetic mutation which took place 6,000-10,000 years ago and is the cause of the eye color of all blue-eyed humans alive on the planet today.

As previously mentioned, exposure to light causes your body to produce more melanin. Even if your eye color has set, your eye color could slightly change if you expose your eyes to more sunlight. As a result, your eyes might appear a darker shade of brown, blue, green, or gray, depending on your current eye color.

This is likely because blood vessels in your eyes become more open with age and allow more cholesterol and other fats to leak into the cornea. About 60 percent of people ages 50 to 60 have this condition. After age 80, almost 100 percent of people will develop this arc around their cornea.

Only about 2 percent of the world’s population has green eyes. Green eyes are a genetic mutation that produces low levels of melanin, but more than blue eyes. As in blue eyes, there is no green pigment. Instead, because of the lack of melanin in the iris, more light scatters out, which make the eyes appear green.