How many chromosomes do humans with down syndrome have?

What came first the elephent or the crocodile

Directions: read the descriptions of the four islands presented in the lesson. 1. list two new traits that each new species of rat might demonstrate as it adapts to the conditions on each island. 2. introduce one of the four new rat species to another island and describe one challenge it would encounter and one success as it adapts to its new environment.

Interferons play a vital role in the immune system why are interferons so important?