All organsims share (a)   as their genetic code.

The (a)   percentage of the genome shared with another species, the ​ (b)   closely related the species are.

(a)   genes define parts of the body plan, such as the number and location of eyes, the location of the gut, and the development of wings instead of legs.

(a)   in Hox genes leads to different body plans developing.

The most common mutation in Hox genes is ​ (a)   .

All invertebrates look ​ (a)   at early stages of development, suggesting evolutionary ​ (b)   .

Features found in different organisms that share structural similarities but may have very different functions (a)  

The appearance of ​ (a)   structures across species is strong evidence for common descent.

It is highly ​ (a)   that similar anatomy in different species would evolve ​ (b)   .

Structures that are similar in function but are not similar in origin (a)  

Remnants of once-important structures that have gradually lost all or most of their function over time. (a)  

Which of the following is a vestigial structure in humans? (a)  

The theory that natural disasters such as floods and volcanic eruptions have happened often during Earth’s long history.  These events shaped landforms and caused species to become extinct. (a)  

The theory that changes in landforms result from slow changes over a long period of time. (a)  

The theory that the geologic processes that shape the Earth are uniform, or remain the same, through time. (a)  

The preserved remains of an organism, or the trace evidence of an organism’s existence in the past. (a)  

Most fossils form in ​ (a)   .

In any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it. (a)  

Tiktaalik roseae is a transitional fossil between fish and ​ (a)   .

By examining the fin of a primitive fish, scientists have found similarities in bone structure to that of modern day reptiles, birds, and mammals. What type of evidence does this describe? (a)  

Astyanax mexicanus is a species of tetra fish that dwells in bodies of water deep inside caves. Even though they cannot see, these fish still have small, nonworking eyes. These eyes are examples of which type of structure? (a)  

Based on the figure, humans share the most DNA with which of the following species of animal? (a)  

In this image, the yellow shaded bones all appear similar in structure. However, their functions differ. Which describes the function of the yellow bones in the bat? (a)  

In this image, the yellow shaded bones all appear similar in structure. However, their functions differ. Which describes the function of the white bones in the whale? (a)  

What type of structure does this image illustrate? (a)  

The diagram shows fossils in different rock layers. Which of these statements about the age of these fossils is most likely correct? (a)