Humans share several features with salamanders due to common ancestry. Certain genes and proteins are nearly identical between the two species; both species have four limbs with a similar skeletal structure; the species’ early embryos are very similar; and where the salamander has a functional tail, humans have a vestigial tailbone. In evolutionary terms, these are examples of     

The chemical composition of the gases surrounding the Earth has changed substantially over the past 4 billion years. One notable change was due to the emergence of photosynthetic organisms. The process of photosynthesis increased the amount of what gas in the atmosphere?       

WHICH OF THE FOLLOWING PROVIDES THE BEST EXAMPLE OF ANALOGOUS STRUCTURES RESULTING IN CONVERGENT EVOLUTION

The only mechanism of evolution that leads to adaptation is

Which of the following is TRUE about The Cambrian explosion?

Which of the following was NOT a distinct novel step in evolution in eukaryotes?

PRE-ZYGOTIC BARRIERS CAN INCLUDE

The presence of mitochondria and chloropplasts in eukaryotes can best be explained by

The diversity of marsupials, but the presence of few other (placental) mammals in Australia can be explained by 

What alerts the police to the body hidden in the wall?