Question 25 of 25
2 Points
A biologist began studying a population of bullfrogs. In 1998,
she found that most of the male frogs croaked, but some did
not. A bat species known to prey on male frogs migrated to
the area in 2005. The biologist returned to the area in 2008
and repeated population counts of male frogs. The table
shows her data.
1998
2002
2004
2008
Number of
noncroaking males
244
368
298
1086
Number of croaking
males
742
1165
791
305
What factor most likely caused the noncroaking male
population to increase after 2004?
O
A. Learning to avoid the new predator
O
B. Adaptation of the croakers in the presence of a new predator
O
C. Extinction of the croakers because of the new predator
O
D. Selective pressure in the form of a new predator
SUBMIT

What are some natural processes that represent physical and chemical changes?

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

Archeologists have discovered three sites showing conclusive evidence for the mastery of fire in tanzania, from a period slightly after the time that homo habilis was present in africa. these sites clearly were founded by homo erectus, the descendent species of homo habilis that migrated north, out of africa and into asia. homo erectus was known to have mastered fire, from ample evidence at sites in asia. there is no reason to attribute mastery of fire to homo ergaster, the descendent species of homo habilis that remained in africa.which of the following is an assumption on which the argument depends? (a) before their migration, homo erectus occupied african territory as far south as tanzania.(b) the strain of migration provided the selective pressure motivating homo erectus‘ mastery of fire.(c) homo ergaster would not have derived as much benefit from the mastery of fire as did homo erectus.(d) homo ergaster inherited all cultural knowledge from homo habilis, a species that did not have mastery of fire.(e) homo ergaster did not occupy regions as far south as tanzania until well after the time of these three sites.