Analyst Questions

Br-Br.

In Br2, two of the same atoms, pull on each side of the bond is equal making it as non-polar.

The other options all include a significantly more electronegative atom (the oxygens and the chlorine), so those bonds are all polar covalent.

The energy in most ecosystems comes from sun light.

Guglielmo Marconi, an Italian invetor invented Radio in 1890's.

A clade is a group of ancestral species and all its descendants. Hence it is a branch of one same species and so monophyletic.

Epithelial tissue is made of layers of cells that cover the surfaces of the body that come into contact with the exterior world, line internal cavities, and form glands.

The four types of tissue in the body are epithelial, connective, muscle, and nervous. 

Acceleration is nothing but the rate at which velocity changes over time.