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Verizon [17]
3 years ago
8

Tina asks the question "Does caffeine increase the heart rate of an earthworm?" In Test 1, she measures the heart rate by lookin

g at the earthworm under a microscopes, the earthworm has a heart rate of 50 bpm (beats per minute). In Test 2, she places a few drops of caffeine on the earthworm's skin and measures the rate again. In this test, the heart rate is 68 bpm. The independent variable is
Biology
1 answer:
Greeley [361]3 years ago
7 0
The independent variable is the caffeine.
it controls the bpm.
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goldfiish [28.3K]

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Explanation:

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4 0
3 years ago
Where are rain gauges located?
Ymorist [56]

The rain gauge is an instrument used by meteorologists to measure the amount of precipitation in a particular region in a particular amount of time.  

The rain gauge is placed on the ground in order to collect the rain or the precipitation sample. The rain gauge is labelled with the quantities, which can be used to measure the amount of precipitation.

So, the correct answer is option (a). on or near the ground.


4 0
3 years ago
Read 2 more answers
When listing the levels of organization in organisms from smallest to most complex, which level is just below organs in complexi
Art [367]
Tissues are below organs
6 0
3 years ago
You are given a 1 liter bacterial culture in exponential stage of growth. The generation time of the bacteria is known to be 30
nydimaria [60]

Answer:

Option-A

Explanation:

A bacteria divides by binary fission which divides a parent bacteria into the two daughter cells and generation time refers to the average time difference between two consecutive generations.

The bacterial cell grows by the exponential function that is by 2^{number of generation} x initial population of bacteria.

In the given question,

<u>Initial population</u>

the initial population of bacteria - 2x 10³ per ml

So per liter, the bacterial population will be 2 x 10 ⁶

<u>Generation time</u>

1 generation time of bacteria is 30 min.

so 5 hours will have- <u> </u>\frac{300}{30}= 10 generations

<u>New bacterial population</u>

Using formula<u>  </u>2^{number of generation} x initial population of bacteria

2^{10} x (2 x 10⁶)

= 1048 x (2 x 10⁶)

2048 x 10⁶

Thus, Option-A is the correct answer.

4 0
3 years ago
HELP PLEASE I WILL MARK BRAINLIEST
natta225 [31]

Answer:

The answer is 0.2

Explanation:

You subtract 8.05 - 7.85 = 0.2

3 0
2 years ago
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