Answer:
Matthias Jacob Schleiden was a German botanist who, with Theodor Schwann, cofounded the cell theory. In 1838 Schleiden defined the cell as the basic unit of plant structure, and a year later Schwann defined the cell as the basic unit of animal structure.
Explanation:
A base is a proton acceptor, according to the theory of Bronsted-Lowry. The oxides of metals are anhydrides, it is the result of the Arrhenius base once the water molecules are removed. Thus, the first, fourth and last chemical equations are considered as a base.
Answer:
The position of an element on the periodic table is determined by how many protons it has in its nucleus.
A toxic substance<span> is a </span>substance<span> that can be poisonous or cause health effects. People are generally concerned about chemicals like polychlorinated biphenyls (PCBs) and dioxin which can be found at some hazardous waste sites.</span>
The half-life would be 500 years.
25% means that 2 half-lives have already passed. So one half-life is 500 years.