Given that s ⊥ t and r ⊥ t, what conclusion can be made?

If s, r and t are given right lines in the same plane and with condition

s⊥t  and r⊥t we can conclude that s║r ( s and r are parallel).

Good luck!!!

Answer is probably E

Explanation:

The S wave alone usually doesn't tell very much about whether cardiac abnormalities are present. You don't always see an S wave in some leads even in normal ECGs. The fact that the rest of the ECG appears normal is reassuring and suggests the absence of the S wave in one lead isn't meaningful.

At pH 7.0, net charge of peptide R-E-T-C-H will be zero (0).

When pH in solution is greater than the pKa value ( for -COOH), it will be deprotonated. When pH is less than pKb (-NH3+) value of an aminoacid, it will be protonated.

The amino group and carboxy group, which are involved in peptide linkege, they don't participate in this process (protonation or deprotonation). Only side chains, free amino and carboxyl end are involved in this process.

Picture is attached:

It's climax

Step-by-step explanation:

I think it may be A. Exposition.