1. What percentage of the earth is covered by water?
2. What sorts of signals does the brain use to communicate sensations, thoughts and actions?
3. Did dinosaurs and humans ever exist at the same time?
4. What is Darwin's theory of the origin of species?
5. Why does a year consist of 365 days and a day of 24 hours?
6. Why is the sky blue?
7. What causes a rainbow?
8. What is it that makes diseases caused by viruses and bacteria hard to treat?
9. How old are the oldest fossils on earth?
10. Why do we put salt on sidewalks when it snows?
Nonsense report
wrong answer report
incomplete answer report
wag hula hula
kung d mo alam edi wag mo sagutin
Share
1. → 71 percent Only
2. → The chemical and electrical signals are used by brain for communication,sensation and thought
3. → No After the dinosaurs died out, nearly 65 million years passed before people appeared on Earth.
4. The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits
5. A year has 365 days, because this is the time the Earth takes to complete 1 full revolution aroung the Sun. A day has 24 hours, because this is the time the Earth takes to complete 1 full rotation on its axis.
6. Gases and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
7. A rainbow is caused by sunlight and atmospheric conditions. Light enters a water droplet, slowing down and bending as it goes from air to denser water.
8. lo siento, no lo sé
9. 3.4 billion years
10.
dyk? The actual reason that the application of salt causes ice to melt is that a solution of water and dissolved salt has a lower freezing point than pure water.
#CarryOnLearning ¯\_ʘ‿ʘ_/¯
#MakeBrainlyCommunityGreat ⁄(⁄ ⁄•⁄-⁄•⁄ ⁄)⁄
Answer
1. About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog.
2. the chemical and electrical signals are used by brain for communication,sensation and thought
3. No! After the dinosaurs died out, nearly 65 million years passed before people appeared on Earth. However, small mammals (including shrew-sized primates) were alive at the time of the dinosaurs.
4. What is Darwin's Theory of Evolution? The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits.
5. A year has 365 days, because this is the time the Earth takes to complete 1 full revolution aroung the Sun. A day has 24 hours, because this is the time the Earth takes to complete 1 full rotation on its axis.
6. Gases and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
7. A rainbow is caused by sunlight and atmospheric conditions. Light enters a water droplet, slowing down and bending as it goes from air to denser water. The light reflects off the inside of the droplet, separating into its component wavelengths--or colors. When light exits the droplet, it makes a rainbow.
8. Many human illnesses are caused by infection with either bacteria or viruses. · Most bacterial diseases can be treated with antibiotics, ...
9. 3.4 billion years
3.4 billion yearsThe oldest accepted fossils are those from Strelley Pool in the Pilbara region of western Australia. They are stromatolites: preserved mats of microorganisms sandwiched between layers of sediment. The fossils are 3.4 billion years old.
10. The actual reason that the application of salt causes ice to melt is that a solution of water and dissolved salt has a lower freezing point than pure water. ... Ice in contact with salty water therefore melts, creating more liquid water, which dissolves more salt, thereby causing more ice to melt, and so on.