Question

a young researcher wants to test how well extremophiles, organisms that thrive in extreme conditions, live in different environments. she will do this by putting extremophiles of different species into different solvents. because of limited lab space, she can run only one sample at a time, and each sample must remain undisturbed for 7 days. to reduce the total time needed to process all samples, the researcher decides to use two acidic solutions along with a control. the information below includes the extremophiles and the solvents the researcher will use in her tests.
species of extremophiles
t. prosperus a. aceti a. brineyi h. acidophilium
solvents
name hydrochloric acid ascorbic acid water
ph 1.3 4.2 7.0
based on the tables, how many days will all of the researchers experiments take?
you may use the calculator.
a. 7 b. 21 c. 49 d. 84

Explanation:

Step1: Identify number of species and solvents

There are 4 species of extremophiles and 3 solvents.

Step2: Calculate number of combinations

The number of combinations of species - solvent pairs is \(4\times3 = 12\).

Step3: Consider samples per pair

The researcher runs one sample at a time and each sample must remain undisturbed for 7 days.

Step4: Calculate total days

The total number of days for all experiments is \(12\times7=84\) days.

Answer:

D. 84