Answer:
Life is suggested to have started in an aquatic ecosystem - the ocean.
Explanation:
For decades, life has been suggested to have started in an aquatic environment due to evidence of ancient fossils and chemical studies.
Recently, scientists have been able to narrow these suggestions to state that life originated in a deep sea hydrothermal vent. This hypothesis arised due to the presence of chemicals that are thought to have produced the chemical reactions that are necessary for the evolution of life.
The first living forms on Earth were single-celled micro-organisms called stromatolites - <em>rock-like structures formed by cyanobacteria</em> - that appeared around four billion years ago. Interestingly, we are still able to find these ancient creatures but only in specific regions of the world such as Cuatro Cienegas, Coahuila in Mexico.
The atomic number of an element determines the number of protons in its nucleus and also its chemical properties.
The element Carbon has an atomic number of 6. Therefore, meaning that is has 6 protons in its nucleus.
Answer:
Flu vaccinations are fundamental as they reduce the risk of flu illness by over 50%.
Explanation:
Flu vaccinations <u>reduce the risk of flu illness by over 50%</u>. This makes this process extremely important and fundamental for all human beings as they <u>not only protect the person who gets the vaccine, but it also contributes to the prevention of spreading to other people</u>, especially children and older adults who possess a greater risk of developing flu complications.
<u>The antibodies that are produced by the vaccine prevent the flu virus from attaching to a healthy cell</u>. However, if a person has not been vaccinated, <u>the virus will attack the healthy cells</u> because there is an absence of antibodies that prevent this process.
Stars are classified based on the spectral type (i.e. a means to measure the photospheric temperature and density by getting information about the ionisation state).
Under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest (O type) to the coolest (M type) (Harvard Spectral classification based on the surface temperature of the stars). A luminosity class is added to the spectral class using Roman numerals (Yerkes Spectral classification). This is based on the width of certain absorption lines in the star's spectrum (0 or Ia+ - hypergiants, I - supergiants, II - bright giants, III - regular giants, IV - sub-giants, V - main-sequence stars, sd - sub-dwarfs, and D - white dwarfs).
