Describe briefly why stars twinkle.

Why do stars twinkle ?

Planets twinkle.

Describe briefly the three physical properties of water which helps in ascent of water in xylem.

Describe briefly the four major groups of Protozoa.

Describe briefly the four major groups of protozoa.

Describe Amphibia.

Describe briefly: (a) Arithmetic growth (b) Geometric growth (c) Sigmoid growth curve (d) Absolute and relative growth rates

Describe - Centriole