Label the following on the ECG above and use the space below to explain the underlying heart activity (Ex: depolarization of atria or contraction of ventricles, etc.) that occurs during the following events of a sinus rhythm: P-wave
P-R interval
QRS-complex
Q-T interval
T-wave
ST-segment

the answer is c.) there is a warm front in region a and a stationary front in region b.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.

d. cellulose and starch