Answer:
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.
A closed system is a system that makes no physical or chemical exchanges with its environment. Of these systems provided as choices (tree, human, clock, car), only a clock does not make exchanges with the environment, except for energy.
Therefore, of that list, only a clock would be a closed system.
Hope that helped! =)
I did this in my class a year ago and as far as i remember it was in the 1700 but i think 1767 to be exact
Bio refers to study of living things + technology (is pretty straightforward- i dont think i need to explain this)
This means Vincent modifies the DNA of bacteria to study the function of their genes is the correct answer :)
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Answer: 5% to 20% </span>
Energy flow can be defined
as the amount of energy that moves through a food chain and it flows through
ecosystem in one direction. Thus, the largest source of energy for an ecosystem
is the sun and the energy that enters the ecosystem is usually measured in
calories or joules.
