Over time Pangaea broke apart to form other continents. Which group of modern day continents composed Laurasia?

North America, Europe, and most of Asia

Antarctica, South America, and Europe

Africa, South America, Antarctica, Australia, and the subcontinent of India

North America and South America

North America, Europe, and most of Asia

Explanation:

North America, Europe, and most of Asia are the modern continents where we expect to find the species with laurasian distribution.

1.  The enzyme dicer cleaves dsRNA to form

small interfering RNA (siRNA).

2.  The siRNA binds to a special protein,  

which degrades one strand.

3. One strand of siRNA associates with the

protein to form an RNase complex.

4. The RNase complex binds to a specific

mRNA and degrades it.