Answer:
O silicon (Si)
Explanation:
-Valence electrons are electrons of the outermost shell which can participate in chemical bonding. ... -As in silicon, four electrons are present in the outermost shell, so silicon has Four valence electrons.
<span>Plants get CO2 by gaseous exchange, water from the soil, and required energy by photolysis of water to make sugar.</span>
Answer:
Glad I can help!!
Explanation:
Technology such as lenses, magnifying glasses, and microscopes had an impact on the development of the cell theory. Below are some examples of how such technologies contributed to the cell theory. Robert Hooke is accredited with observing the first cells in 1665.
They are both happening very slowly
Answer:
Involve changes in one or few nucleotides/ bases
Explanation:
Point mutations most commonly involve the substitution of one base for another (which changes the complementary base as well in DNA). The term point mutationt also includes insertions or deletions of a single base pair.