Question

Which event shows the pattern of coordinated stasis?
A- Major hurricanes and other weather variations destroyed regions of coastline ecosystems.
B- Global cooling 2.8 million years ago resulted in dry grasslands replacing wet forests in parts of Africa.
C- The volcanic eruption of Mount St. Helens in 1980 spewed vast amounts of ash into the air.
D- The removal of a geographic barrier united species that were previously reproductively isolated.

Answer 1

Option C

Explanation

The crocodilian has perhaps the most complex vertebrate circulatory system. It has a four-chambered heart and two ventricles, an unusual trait among extant reptiles, and both a left and right aorta which are connected by a hole called the Foramen of Panizza.

Phylum: Chordata

Kingdom: Animalia