Which artery is absent in a frog?

Which of the following statements is correct?

The function of leghaemoglobin in the root nodules of legumes is:

For all values of $a$ and $b$,the line $(a+2b)x + (a-b)y + (a+5b) = 0$ passes through a fixed point. Find that point.

Which taxonomic category is written first when writing the scientific name of an organism?

Four bodies $P, Q, R$ and $S$ are projected with equal velocities having angles of projection $15^o, 30^o, 45^o$ and $60^o$ with the horizontal respectively. The body having the shortest range is