sci 115 complete questions

Need help with my Science question – I’m studying for my class.

QUESTION 1

1. Which type of fossil is considered a trace fossil?

   	a.	footprint
   	b.	shell
   	c.	seeds
   	d.	teeth
   	e.	spores

3 points

QUESTION 2

1. Darwin incorporated Malthus’ idea that _____ into his theory of evolution.

   	a.	humans have the capacity to produce more offspring than the environment can support
   	b.	populations will always produce more individuals than the environment can support
   	c.	populations will never produce offspring in stressful environments
   	d.	humans will only produce the number of individuals that the environment can support
   	e.	populations under environmental stress will become extinct

3 points

QUESTION 3

1. An example of morphological divergence is the wing of a bat and the ____.

   	a.	femur of an elephant
   	b.	femur of a human
   	c.	hand of a human
   	d.	foot of a human
   	e.	leg of a chicken

3 points

QUESTION 4

1. When a certain form of a trait increases the fitness of the individual, this allele will tend to ____ over time.

   	a.	increase in frequency in the population
   	b.	decrease in frequency in the population
   	c.	be eliminated from the population
   	d.	affect the function of vestigial structures
   	e.	lead to extinction of the population

3 points

QUESTION 5

1. How are fossils older than 60,000 years dated?

   	a.	dating rock formations below the fossil only
   	b.	directly dating the fossil with uranium 238
   	c.	dating rock formations above the fossil only
   	d.	directly dating the fossil with 14C
   	e.	dating rock formations above and below the fossil

3 points

QUESTION 6

1. Puppies born too large experience difficulties during birthing and tend to have respiratory and other problems. Puppies born too small often can’t compete with their siblings for their mother’s milk. Thus, puppies of intermediate size have a survival advantage. This is an example of ____ selection.

   	a.	directional
   	b.	stabilizing
   	c.	allelic
   	d.	disruptive
   	e.	frequency

3 points

QUESTION 7

1. The branch points on a cladogram represent ____.

   	a.	mass extinctions
   	b.	related clades
   	c.	derived characters
   	d.	a common ancestor of two lineages
   	e.	the spcecies’ extinction

3 points

QUESTION 8

1. In a population of rabbits, those able to outrun predators will survive to reproduce, eventually leading to a population of faster rabbits. This is an example of ____ selection.

   	a.	restricted
   	b.	disruptive
   	c.	mutational
   	d.	stabilizing
   	e.	directional

3 points

QUESTION 9

1. Two species of toads have been successfully interbred in a laboratory but do not hybridize in nature because one species mates in summer and the other mates in the fall. This is an example of ____ isolation.

   	a.	physical
   	b.	ecological
   	c.	inbred
   	d.	genetic
   	e.	reproductive

3 points

QUESTION 10

1. A random change in allele frequency over time that is brought about by chance alone is known as ____.

   	a.	balanced polymorphism
   	b.	natural selection
   	c.	gene flow
   	d.	genetic drift
   	e.	disruptive selection