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mihalych1998 [28]
3 years ago
12

Water fleas (Cladocera) are small freshwater crustaceans. They are filter feeders can are about 3-5mm long. The outer carapace o

f a water flea is transparent so the internal organs can be observed. Caffeine raises the heart rate of humans. Hanna predicts caffeine will have the same effect on other organisms. She uses the water flea as her test subject in an experiment. Hanna introduces varying amounts of caffeine to water flea populations. Using a microscope, she measures the heart rate in beats per second of sample water fleas. She records the data in a table. As the concentration of caffeine increases, Hanna observes the water flea heart rate also increases. What is the hypothesis in Hanna’s experiment? A) Caffeine raises the heart rate of humans. B) Water fleas prefer caffeine over plain water. C) Caffeine increase the heart rate of the water flea. Eliminate D) The effects of caffeine are the same on all organisms.
Biology
1 answer:
quester [9]3 years ago
3 0

Answer:

The Answer is C.

Explanation:

sorry i took awhile

You might be interested in
The Great White Shark is on its way to being endangered. Why? Cite your evidence to support your response.
Brilliant_brown [7]

well according to my memory and one of the save the earth communities, the great white shark is almost extinct cause of pollution, and mainly poachers, lots of poachers for soup made of shark fins.

they would cut off the fin then throw the dead shark back in the ocean.

i hope this helped.

☜(゚ヮ゚☜)(☞゚ヮ゚)☞

3 0
3 years ago
What is the relationship between the rate of wind and the amount of abrasion?
Andreyy89

Answer: Wind speed is also important. The rate of erosion caused by a 30-mile-per-hour wind is more than three times that of a 20-mile-per-hour wind. Wind erosion decreases as soil moisture increases. For example, dry soil erodes about one-and-one-third times more than soil with barely enough moisture to keep plants alive.

Explanation:

https://www.agry.purdue.edu/soils_judging/new_manual/ch6-wind.html Hope this helps

4 0
3 years ago
Which is the bacteria that is most concerning regarding a plantar puncture wound to the sole of the foot through a rubber soled
asambeis [7]

Answer:

<em>Pseudomonas aeruginosa.</em>

Explanation:

<em>Pseudomonas aeruginosa </em>is a gram negative, rod shaped bacteria that proves to be pathogenic for plants, humans and other organism. This bacteria is a multi drug resistance pathogen.

<em>Pseudomonas aeruginosa </em>causes osteomyelitis  that involves the plantar puncture to the foot sole. The bacteria can cause specific skin injuries and more risk is present in the diabetic patients. This bacteria can also cause various post operative injuries.

Thus, the answer is <em>Pseudomonas aeruginosa.</em>

4 0
4 years ago
Need help figuring this out! Am having a bit of trouble with it
Nataliya [291]

Explanation:

BB=Brown as both are big B's

Bb=Brown as there is a big B

bb=Blue as both are little b's

5 0
3 years ago
Hen there is a cut in the skin and bacteria enter the body, the immune system responds. First, macrophages approach the area of
Semenov [28]

Correct answer: B). The phagocytotic barrier, which is a part of innate immunity

The scenario represents the phagocytosis, which is a type of endocytosis by which the cell engulfs microbial pathogens. The main cells of the immune system that are involved in phagocytosis include macrophages, neutrophils, and dendric cells.

It is a mechanism which is used by the immune system to kill and processing of antigen that play an important role in innate immune response.

Hence, the correct answer would be option B.

4 0
4 years ago
Read 2 more answers
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