Acertain population of beavers builds dams across a stream to catch fish. some years the stream carries more water than other
years! the data below was collected by scientists studying the stream over a sixteen year period.
average stream depth average number of average number of
years
(meters)
beaver dams beavers
2000-2003 1.20
- 17
2004-2007 0.92
- 12
2008-2011
1.45
7
21
2012-2015 0.78
2
if the average depth of the stream for the next 4 years is 1.60 meters, which of the following is most likely to occur?
a.
the average size of each beaver will increase.
b.
the size of the beaver population will increase
c.
the size of the beaver population will decrease
d.
the average size of a beaver dam will decrease
reset
submit
- 40 answered
session timer: 10: 33
session score: 50% (4/8)

The chemical form of energy that is useable by the cell to do work

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer

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.