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

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.