1. An analysis of DNA and RNA sequences can be used to classify organisms. A dendrogram, such as
the one shown below, is based on molecular data. It can be used to represent evolutionary
relationships within a group of organisms that are hypothesized to have descended from a common
ancestor.
Brown bear
Sun bear
Spectaded bear
Giant panda
Lesser panda
Raccoon
Dog
100 50 60 40 20
Millions of Years Ago
Which statement is best supported by the information in this dendrogram?
A. Lesser pandas are more genetically similar to giant pandas that they are to raccoons.
B.
Brown bears are more genetically similar to giant pandas than they are to sun bears.
C
Lesser pandas are more genetically similar to raccoons than they are to giant pandas.
D
The bear species are all more genetically similar to dogs than they are to giant pandas.

Populations of blue-winged warblers, a type of bird, migrate south in the winter and return to canadian breeding grounds in the spring. as global temperatures have increased due to climate change, spring has started arriving in the warbler's breeding grounds earlier in the year, before the warblers return. warblers now arrive at their breeding grounds too late to select ideal nesting sites and to feed on important early-spring food sources how are populations of blue-winged warblers most likely to be affected by the earlier arrival of spring? o a. populations will go extinct since the warblers will stop migrating to breeding grounds. b. populations will be unaffected since most species can quickly adapt to effects of climate change. c. populations will increase since warmer temperatures are generally beneficial to survival, d. populations will decline since individuals will be less likely to successfully reproduce, reset next