Answer:
Oxygen is essential to enabling many of the Earths life forms to survive -- without access to oxygen, humans cant live for more than a few minutes. The air that enters human lungs contains about 21 percent oxygen. The process responsible for producing most of the Earths oxygen is known as photosynthesis. In this process, plants and certain other organisms convert sunlight into oxygen and other products.
Explanation:
Answer:
Climate change has caused ocean levels to rise higher.
Explanation:
The answer is 23.
A human being receives 23 chromosomes from each parent. So each human has 46 chromosomes. Chromosomes X and Y determines your sex.
Answer:
All viruses have is a protein coat and a core of genetic material, either RNA or DNA. Unlike bacteria, viruses can't survive without a host. They can only reproduce by attaching themselves to cells. ... Also unlike bacteria, most viruses do cause disease, and they're quite specific about the cells they attack.
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The main 3 subatomic particles that makes up an atom are protons, neutrons, and electrons.
Protons and neutrons exists inside the nucleus of the atom, while electrons moves freely outside the nucleus.
Protons are positive in charge, each element has their own specific number of protons, it's just like their ID number for the element, they cannot be changed.
Neutrons are neutral, just like as it name says. Usually they have the same number as the protons in most elements, but not all cases. Sometimes an element may even have a few different forms, called Isotopes specifically, where they have different number of protons for each isotope.
And electrons, are negative in charge. They're a lot more lighter comparing to neutrons and protons, therefore sometimes we neglect their mass in calculating maths. In an atom, the number of electrons must be the same as the number of protons, or else, the atom would no longer be an atom, but an ion instead.