What is the minimum frequency of light necessary to emit electrons from titanium via the photoelectric effect?

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.