Mass extinctions at the end of the Ordovician occurred because of ____.

In the Late Paleozoic, the ________________ was characterized by black shale deposits and reef development.

________ are part of cratons, and are the flat-lying areas, over which seas may transgress or regress.

In SWOT analysis, what does the O stand for?

Pelagic fish are part of the benthos.

Describe two barriers to treatment options of CHF in rural populations and two ways we can begin to alleviate these barriers.

The Carboniferous coal deposits of North America probably were derived from plants that grew in desert climates.

Chordate (vertebrates) and echinoderm (invertebrate) share a _______________ embryonic cell arrangement.

The patient and their caregiver would like to participate in exercise several days a week to improve mobility and mood but are concerned about safety. Which of the following types of aerobic exercise would be the BEST choice for patient and caregiver’s home exercise program? 

The time until a screen is cracked on a smart phone has an Exponential distribution with mean μ = 500 hours of use. Denote the time by X.  I. Find the probability that the screen will not crack for at least 650 hours. II. Derive the CDF of this random variable X.