control variables
are all of the variables that you keep the same in each experimental treatment while you are manipulating the independent variable
control treatments
is the experimental treatment in which you do not manipulate the independent variable
Population decreasing, death rate very low and birth rate lower than death rate
stage 5
High and stable birth rate, stable population size
stage one
Population size increasing exponentially, birth rates decreasing rapidly, death rates decreasing at a slowing rate
stage 3
Stable population with a high death rate
stage 1
Stabilizing population, decreasing birth rates and stabilized death rates
stage 4
The first stage in which family planning is a real aspect of life
stage 4
Population growing exponentially, death rates decreasing rapdily, birth rates stable
stage 2
percent water by weight =
((moist weight - dry weight)/dry weight*100)
(mass of water os soil/mass of dry soil)*100
bulk of soil
(mass of soil/volume of soil)
volume of cylinder
pi(3.13159) r squared
particle density
dry mass of soil/ dry volume of soil
soil porosity percentage
(1-(bulk density/particle density))*100
how to determine percentage of soil component
divide by height of layer by the total height of soil
percent water by mass
((volume of water)/(mass of soil)*100)
density
number found/area searched
determining population size
density*habitat size
population w/ mark and recapture
N = first time(second time/ ones marked found second time)
doubling time
70/ annual growth tate
exponential growth
r (how many produce per unit of time) * the size of the population