Which of the following represents the correct hierarchy of controls for hazard management?

PPE training must include which of the following?

According to 1910.132(d), the PPE hazard assessment must:

Respirators used voluntarily must still be evaluated for employee medical fitness.

The PPE hazard assessment must be certified in writing by the employer.

Employers are required to perform a written hazard assessment to determine the need for PPE.

Under 1910.132, employers must provide PPE at no cost to employees.

Under 1910.133(a)(1), employers must ensure that employees use appropriate eye or face protection when exposed to hazards such as:

A mosquito species breeds in rain-filled tree holes scattered through a forest. Each tree hole is a separate population, and together they form a metapopulation. In a metapopulation, source populations are stable or growing populations that produce excess individuals that can disperse and colonize other patches, whereas sink populations are unstable populations that persist only because of immigration from elsewhere. The table below shows approximate characteristics for five representative tree holes.   Tree hole Population size Extinction probability (E) Colonization probability (C) A 80 0.10 0.40 B 25 0.50 0.60 C 100 0.05 0.10 D 10 0.80 0.70 E 40 0.30 0.20   A) Which two tree holes are most likely to act as source populations, and why? (3 pts)           B) Which two tree holes are most likely to act as sink populations, and what would happen to them if dispersal between holes stopped? (3 pts)  

Which of the following is a density-dependent limiting factor?