1. Objective
2. Objective
3. Opinionated
4. Objective
5. Opinionated
6. Opinionated
7. Objective
8. Opinionated
Answer:
C.
In general, prokaryotic cells do not have a true nucleus or membrane-bound organelles, whereas eukaryotic cells contain both a nucleus and organelles enclosed by membranes.
Explanation:
Lichen will colonize the bare rock.
Answer:
A) Plants can’t photosynthesize at night.
C) Plants need ATP production for the entire day.
Explanation:
A) is correct. Photosynthesis occurs only in daylight hours.
B) is wrong. Photosynthesis peaks at noon when the sun is at its peak.
C) is correct. Plant respiration occurs both day and night.
D) is wrong. Photosynthesis begins at sunrise.
Answer;
-B3
Explanation;
Refrigerants are divided into two groups according to toxicity:
-Class A signifies refrigerants for which toxicity has not been identified at concentrations less than or equal to 400 ppm; and
-Class B signifies refrigerants for which there is evidence of toxicity at concentrations below 400 ppm.
They are also divided into three groups according to flammability:
-Class 1 indicates refrigerants that do not show flame propagation when tested in air at 21°C and 101 kPa;
-Class 2 indicates refrigerants having a lower flammability limit of more than 0.10 kg/m3 at 21°C and 101 kPa and a heat of combustion of less than 19 kJ/kg;
-Class 3 indicates refrigerants that are highly flammable as defined by a lower flammability limit of less than or equal to 0.10 kg/m3 at 21°C and 101 kPa or a heat of combustion greater than or equal to 19 kJ/kg.
-Therefore; the answer for the above question would be Class B and class 3.
