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Exotic species can  become invasive in their new habitat, because of absence of their predators.  They can threaten the native species by competing for their resources, being predators, or bringing disease.

_______________ happens when nutrient runoff causing microorganisms (esp. algae) to grow in excess and deplete oxygen for other living things

What would happen to the pH of a strong acid if you added a weak base to it? [answer1] What would happen to the pH of weak acid if you added a strong base to it? [answer2] What would happen to the pH of a strong acid if you added strong base? [answer3] 

Which of the following are the 3 important buffer systems in the human body?

Which of the following biomes is characterized by year-round consistent precipitation, deciduous trees, rich soil, and warm summer?

The process whereby oxygen is depleted by the growth of microorganisms due to excess nutrients in aquatic systems is called ________.  

Displacement is the correct method for determining the volume of an irregular object. [answer1]   How do you calculate displacement? final water volume [mathsymbol] initial water volume

When synthesizing aspirin, 3.012 g of salicylic acid (138.121 g/mol) were used. 2.538 g of aspirin (180.158 g/mol) were recovered. Answer must be to correct significant figures and proper units.   Calculate the theoretical yield of aspirin. [answer1] Calculate the percent yield. [answer2] Calculate the percent error. [answer3]

Match the positive test for protein, gelatin, calcium, phosphate, and ferric ion in bone. 

A 38-year-old male presents with a three-month history of low back pain and right leg pain that has failed to improve with non-operative modalities, including selective nerve root corticosteroid injections. Leg pain and paresthesias are localized to his buttock, lateral and posterior calf, and the dorsal aspect of his foot. On strength testing, he is graded a 4/5 for plantar-flexion and 4+/5 to ankle dorsiflexion. On flexion and extension radiographs there is no evidence of spondylolisthesis. Sagittal and axial T2-weighted MRI images reveal a large L5/S1 disc herniation. Which of the following treatment modalities will allow the greatest improvement of physical functioning?