1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
irina1246 [14]
3 years ago
9

PLEASE HELP You must design a valid experiment to show that there are microorganisms in the air. What would be your dependent va

riable? (Points : 2) sterilized broth growth of organisms in the broth exposure to microorganisms in the air You must design a valid experiment to show that there are microorganisms in the air. What would be your control group? (Points : 2) open flask with unsterilized broth open flask with sterilized broth sealed flask with unsterilized broth sealed flask with sterilized broth
Biology
1 answer:
Komok [63]3 years ago
6 0
You can carry out a test , 
1- take a sample of the air in a test tube 
2-add limewater to the test tube 
3- result : if it turns milky/cloudy it has microorganisms 
4- reason: because every microorganism respires , and so it produces Carbon dioxide . 
and limewater is the test to show the presence of Carbon dioxide . 


You might be interested in
What do checkpoints do in the cell cycle?
denpristay [2]

Answer: Checkpoints in the cell cycle A checkpoint is a moment in the eukaryotic cell cycle where the cell considers internal and external inputs before deciding whether or not to divide. There are other checkpoints, but the following are the three most important: At the G/S changeover, there is a G checkpoint.

Explanation:

knowledge!

5 0
3 years ago
Look at the population pyramid. What conclusion can you draw from it?
balu736 [363]

c. Birth rates are high      

Explanation:

A wide base in the population pyramid shows that there is a large population of young people with high fertility rate or birth rate and high death rate.

From the graph, it can also be concluded that narrow tip at the top shows that lesser older people are in the population.

This pyramid shown in the diagram is a triangular age pyramid. In this type of pyramid the pre-reproductive individuals are high   reproductive individual are moderate and non-reproducing individual is less. In such pyramid we find population grows.

Suppose in a family of ten 6 are pre-reproductive, 2 moderate reproductive and 2 post-reproductive. We will see the in the course of moderate and post-reproductive will die and those six of pre-reproducing age will increase the population.

8 0
3 years ago
Which actions help prevent groundwater erosion? Check all that apply.
KATRIN_1 [288]

Answer:packing down soil

Explanation:

5 0
3 years ago
Which statement best describes the process of asexual reproduction?
maks197457 [2]
The correct answer is C A single-celled protist divides into two cells, and each one becomes another protist.
5 0
3 years ago
Which abiotic factor most likely controls where the plants live in this environment
Setler [38]

Which abiotic factor most likely controls where the plants live in this environment ?

Oxygen levels for aquatic animals

Oxygen from the air and oxygen produced by aquatic plants dissolves in water. Without this, aquatic animals would suffocate and die. Healthy lakes and rivers have high levels of oxygen, and polluted waters often have low levels of oxygen. This pollution means that only certain species can survive there such as sludgeworms. These are bioindicator species because their presence or absence informs us about the condition of the habitat.

Carbon dioxide levels for plants

Carbon dioxide is a reactant in photosynthesis which means plants need it to survive. Areas with higher levels of carbon dioxide are more likely to have healthy plants growing. Farmers often release carbon dioxide within their greenhouses to maximise their crop yield. Woodlands often have higher carbon dioxide levels than open grassland, so many plants living in open areas have evolved mechanisms to overcome a shortage of carbon dioxide.

7 0
2 years ago
Other questions:
  • Compare and contrast streams and rivers<br> Compare and contrast ponds and lakes
    5·2 answers
  • ________________ is the term that describes the displacement of an organ or tissue that protrudes through the wall or from the c
    11·2 answers
  • A gene involved in neural development shows three times as many synonymous site substitutions than nonsynonymous ones. A likely
    6·1 answer
  • You are told that the cells on a microscope slide are plant, animal, or bacterial. You look at them through a microscope and see
    11·1 answer
  • Please I need help with question 35 and 36 and it’s very hard and I’m struggling with it and if you need to see the picture big
    9·2 answers
  • REALLY EASY!!! JUST CAN'T CHOOSE !!!! WILL GIVE BRAINLIEST!!!! AT LEAST TAKE A LOOK!!! ANSWER IF 100% SURE THO!!!
    12·1 answer
  • We the humans are an integral part of the environment but we are a bit different from other creatures. How? What makes us differ
    13·1 answer
  • Is hydrogen peroxide an input or an output?
    9·1 answer
  • .. Which pair of organisms is most likely to have adaptations in common?
    15·1 answer
  •  What can you do to verify its purity? 
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!