The following questions refer to the phylogenetic tree shown in Figure 34.1.

-Which of these is a trend in hominin evolution?
A)increased ability to switch back and forth between bipedalism and quadrupedalism
B)well-developed claws for clinging to trees
C)a shoulder joint increasingly adapted to brachiation
D)increased brain to body ratio
E)a shortened period of parental care of offspring

Question

The following questions refer to the phylogenetic tree shown in Figure 34.1.

-Which of these is a trend in hominin evolution?
A)increased ability to switch back and forth between bipedalism and quadrupedalism 
B)well-developed claws for clinging to trees 
C)a shoulder joint increasingly adapted to brachiation 
D)increased brain to body ratio 
E)a shortened period of parental care of offspring

Quizplus · Accepted Answer

The phylogenetic tree shows an increase in brain to body ratio as hominin species evolve. This is evident in the gradual increase in brain size relative to body size, with Homo neanderthalensis and Homo sapiens having the largest brains in relation to body size.

The Following Questions Refer to the Phylogenetic Tree Shown in Figure