Students are experimenting with a substance that they think can be added to soil to increase the number of flowers a certain plant will make. they set up 20 pots of soil, each planted with the same type of seed. they divide the pots into two groups and add 15 drops of the substance to pots in one group and only 10 drops to pots in the other group. after the plants grow for four weeks, the students count how many flowers each plant has made.

what does this experimental investigation lack?

a control group
an independent variable
a dependent variable
a procedure

troll answers will be reported

Sorry if this isn't correct as it's been quite a while since i've learned this subject but I believe that the answer is dependant variable because the dependant variable would be the number of flowers on the plants and everything else seems to be in check

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day