The passenger pigeon was found in large numbers all across north america. the last passenger pigeon died in 1914. around 300 years ago, they were the most common birds that could be seen flying in the skies. what is the most likely reason that passenger pigeons became extinct?

How do you transfer mrna into codons ? i'm so confused : (

How does the molecular clock work? a. it analyzes the brain functionality of two different species.b. it examines and compares the physical characteristics of two different species.c. it illustrates relationships between two different species.d. it compares the number of mutations that exist in the dna of two different species.

What function does a limb serve in each animal how are the limb bones of the four animal similar based on the similarities what can be inferred about the evolution of the poor animals