The answer is C. None of them combine to make type AB.
Answer:
Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.
Answer:
Ecosystems are closed systems
Explanation:
This answer (Ecosystems are closed systems) is false because ecosystems are open systems by nature.
If it is rounded to the hundredths place, it would be 18.19 if it is rounded to the tenths place, it will be 18.2 and if it is rounded to the whole number, it will be 18.