Biology, 06.10.2019 20:00 halimomohamed
For his science project, austin wants to determine if the ph of standing rainwater changes over time. he collects a jar of rainwater and places it indoors in a spot that does not receive a lot of sunlight to limit evaporation. using a ph testing kit, he measures the ph of the water once a day for 20 days.
what is the independent, or manipulated, variable in austin’s experiment?
a. the number of days the rainwater is allowed to sit
b. the number of times the rainwater is observed
c. the change in the amount of rainwater due to evaporation
d. the change in ph of the rainwater over time
Answers: 1
Biology, 22.06.2019 02:30
Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels
Answers: 1
Biology, 22.06.2019 05:00
Idon’t know the answer and i’ve been stuck on it for a while now skskskskks
Answers: 1
Biology, 22.06.2019 14:00
Science which of the following is an example of a cyclic behavior that is seasonal? i think the answer is d, i just need to double check : ). a. running from predators. b. searching for water. c. hunting at night. d. migrating for warmth. ***
Answers: 1
Biology, 22.06.2019 17:50
To take a whiff of your favorite food, you use both? a. motor nerves and your digestive system b. sensory nerves and your immune system c. motor nerves and your skeletal system d. sensory nerves and your respiratory system
Answers: 2
For his science project, austin wants to determine if the ph of standing rainwater changes over time...
Mathematics, 25.05.2021 03:20
Mathematics, 25.05.2021 03:20
Mathematics, 25.05.2021 03:20
Mathematics, 25.05.2021 03:20
Mathematics, 25.05.2021 03:20
Mathematics, 25.05.2021 03:20
Chemistry, 25.05.2021 03:20
Mathematics, 25.05.2021 03:20
Physics, 25.05.2021 03:20