Most contemporary animal lineages first appeared between 530 and 520 million years ago, the time period referred to
as the ____ explosion.
a. Silurian
b. Cretaceous
c. Cambrian
d. Permian
e. Jurassic
ANSWER: c
You might also like to view...
A student observes a wormlike organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot)
However, it might be a member of the phylum ________, and one way to distinguish between the two possibilities is by looking for the presence or absence of ________. A) Platyhelminthes; a cuticle of chitin B) Nematoda; an alimentary canal C) Annelida; a body cavity D) Nematoda; a circulatory system E) Annelida; muscle in the body wall
In the graph below, how can the change in infant mortality be explained as birth weight increases from 2 to 7 pounds?
A. A larger baby will have more developed organs and thus have greater fitness.
B. A baby closer to 7 pounds will have more developed organs and thus have lower mortality.
C. A baby closer to 2 pounds will not be able to be delivered safely and thus have lower mortality.
D. A baby closer to 7 pounds will have more developed organs and thus have higher motality.
E. A baby closer to 7 pounds will not be able to be delivered safely and thus have higher mortality.
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain and what do they mean?
Gather Content
· What do you already know about fitness? How does it relate to the question?
Consider Possibilities
· What other information is related to the question? Which information is most useful?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Suppose a mutagen is used on an inbred population of mice to establish cell lines, each including a different mutant allele, which can then be tested for function. This technique is known as ________
Fill in the blank(s) with correct word
Refer to Figure 52-2. In this sequence of events the bell is serving as:
a. a motor stimulus. b. the conditioned stimulus. c. a cognition stimulus. d. a sign stimulus. e. the unconditioned stimulus.