BSC 1005 Unit 1 Chp 1 Homework

A(n) _____________ is a testable explanation for an observation.

hypothesis

Over time the DNA sequences of organisms become more and more different from the DNA sequences of there ancestors. If you were to compare DNA sequences among the 6 groups of organisms. Which one would have the most different from all 5?

lizards and snakes

Which of the following is an example of hypothesis-driven science?

testing whether or not dead batteries are preventing a TV remote from working

What is represented on the X Axis of this tree?

time

Which number point on the tree represents the most recent common ancestor of crocodilians, dinosaurs, and birds?

2

Identifying Major Themes - Chapter 1

Can you identify the major theme illustrated by each of the following examples? If necessary, you may review the themes in Chapter 1 of your book. Match the themes on the left with the examples on the right.

What does the left most point of this figure represent?

The species that is a common ancestor to all species shown on the tree

Which type of organism is most closely related to saurischian dinosaurs?

birds

Imagine that your car is stalled and will not start. If you add gasoline to the tank to see if that helps, which step of the scientific method are you performing?

experiment

Which of the following lists the steps of the scientific method in their proper order?

observation, question, hypothesis, prediction, experiment

Which of the following is an example of discovery science?

observing what other students in your class are wearing