The part of the ECG wave that represents ventricular contraction ...

[APUS57]

The part of the ECG wave that represents ventricular contraction is the
 
 P wave
  QRS complex
  PR interval
  T wave

Question 2

In hostile conditions, some bacteria develop a protective coating called a(n)
 
 capsule
  endospore
  ribosome
  pili

[Kimmy]

Answer to Question 1

QRS complex

Rationale: P wave and PR interval relate to atrial contraction; T wave is ventricular relaxation.

Answer to Question 2

endospore

Rationale: During hostile conditions, some bacteria develops a protective coating called an endospore; a capsule is the outermost layer of a prokaryocyte; pili have hairlike protrusions similar to cilia; ribosomes are similar to eukaryotic cells; and plasmids are extracellular DNA.

[APUS57]

Thanks for the timely response, appreciate it

[Viet Thy]

Excellent