According to the results of Study 1, what is the tensile stress near the bottom of a concrete beam

reinforced with steel rod #1, when carrying a

load of 250 pounds?

A. approximately 44 psi

B. approximately 52 psi

C. approximately 60 psi

D. approximately 77 psi

Species can vary in several ways. which of the following is one of darwin's ideas that was accepted by most scientists of his time due to the large number of fossils being discovered at that time? a. species vary around the world. b. species have specific adaptations to their local environment. c. species that live in seawater can also live on mountains. d. species change over long periods of time.