Study the following and pick up the incorrect statements:
I. In commensalism both partners are benefitted due to each other.
II. In amensalism no partner is benefitted.
III. In parasitism, one partner is benefitted and the other is harmed.
IV. In competition both the partners are benefitted.
The percentage error in the measurement of mass and velocity are 3% and 4% respectively. The percentage error in the measurement of kinetic energy is:
If \( L, M, N \) are the midpoints of the sides PQ, QR, and RP of triangle \( \Delta PQR \), then \( \overline{QM} + \overline{LN} + \overline{ML} + \overline{RN} - \overline{MN} - \overline{QL} = \):