Q: Phosphorus exists as several allotropes, the most common being red, black, and what? Choices: - purple phosphorus - yellow phosphorous - green phosphorus - white phosphorus A:
white phosphorus

(Question)
Q: Cigarettes are a major source of what kind of chemical substances linked with cancer? Choices: - chemicals - pesticides - alkaloids - carcinogens A:
(Answer)
carcinogens

Ques: Q: What encloses the border of animal cells? Choices: - Jacket membrane - dust membrane - cells membrane - plasma membrane A:
Ans: plasma membrane

(Q).
Q: What was first discovered in songbirds that produce new neurons while learning songs? Choices: - proteins - Brain Cord - homeostasis - neurogenesis A:
(A).
neurogenesis

Ques:Q: What is the most electron-pair bonds a nitrogen atom can participate in? Choices: - seven - five - three - four A:

Ans:four

Ques: Q: What is the temperature where molecular motion stops? Choices: - Absolute Freezing - Final Zero - mean zero - absolute zero A:
Ans:
absolute zero