Answer – C (Using instruments that have not been calibrated).
When the integrity of an instrument’s calibration has been compromised (usually due to exposure to a shock, vibration, or physical damage), it needs to be calibrated; failure to do this inevitably leads to inaccurate measurement; this is a very common measurement error.
The answer is Valence Electrons
Humans have invented things like clothing, houses, and heating systems to make lands with harsh climates more comfortable or livable. Human had to come up ways in order to be in a position to survive and live in lands with harsh climates such as cold weather, the invented, heating and heating system to always keep them warm.
Ferns, <span>Archaeopteris trees, some types of spores and mosses and lots of forest</span>