A student performed an experiment to see if water temperature affects the level of activity
in aquatic snails. The student set up four tanks with five snails in each tank. All four of the
setups were identical in every way, except for the temperature of the water. In order to
make the conclusions more valid, the student could
A.
alter the pH of the water
B.
change the size of the tank
C.
carry out the experiment for a shorter period of time
D.
use a larger number of snails

D

Explanation:

A is not viable as altering the Ph would affect the snails, and would not focus on how temperature affects the snails

B Expanding the tank would indeed give the snails more room to move around in , but in questions like these, you need to choose the best fit for the question. The larger tank also wouldn't really make the conclusion more valid

C Carrying out the experiment for a shorter length of time would only decrease the amount of data you would get to analyse to determine whether there was  an impact on the snails

D Using a larger number of snails would indeed make the conclusion more valid. This is because the number of snails that are tested increases the validity of a claim of a trend. If 10 snails instead of 5 snails are more active in warmer water, the validity of the claim is higher and more believable.

The correct answer is the option "She forgot to record a transaction"

Explanation:

Hello!

Let's solve this!

Lupe always has to compare his annotations with those of the bank, in order to keep a correct record of his operations. Mainly you have to pay attention to not have problems. If you have the slightest doubt, you can go to the bank and request clarification from a worker.

The correct answer is the option "She forgot to record a transaction"