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hjlf
3 years ago
7

In an experiment to determine the effect of exercise on pulse rate, a student checks his pulse rate before

Biology
2 answers:
nasty-shy [4]3 years ago
6 0
3. It serves as the control for the experiment. If he only checks his pulse rate after exercising th en there is no comparison to show whether th rate has increased, decreased, or remained unchanged.
Andrew [12]3 years ago
3 0

Answer:

The correct answer is option 3.

Explanation:

In the mentioned experiment, the pulse rate prior to performing exercise functions as a control of the experiment. Before doing exercise, the pulse rate would be under normal conditions, that is, without changing any variable, and thus is considered as the control for the experiment.  

In order to find a change witnessed in the pulse rate post performing exercise, the pulse rate post-exercise would be compared with the control pulse rate.  

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andre [41]

We can use a punnet square to predict the outcomes of the offspring when crossing two tall plants, and base the experiment we will perform on those probabilities.

A punnet square is a tool used by many genetic scientists. It uses the genetic makeup of the parents to guess those of the offspring.  The punnet square will give us probabilities for each outcome. We can design an experiment in which we make predictions using a punnet square based on Hom-ozygous alleles and heterozygous alleles.

Only by using two Hom-ozygous plants can we guarantee 100% tall plants, and only by using two heterozygous plants can we produce a short plant. Therefore, we can repeat the experiments until a short plant appears or we can only tall plants, and this way we can single out the Hom-ozygous and heterozygous plants.

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brainly.com/question/19747679?referrer=searchResults

7 0
2 years ago
Because of the large heat of __________ of water, the evaporation from a liquid surface is a very effective cooling mechanism. T
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~Hope this answers your question!~

4 0
3 years ago
Read 2 more answers
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2 years ago
A wave is traveling with a speed of 5m/s for 7 seconds. How far has the wave travelled?
Kay [80]

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