A cylindrical rod 100 mm long and having a diameter of 10. 0 mm is to be deformed using a tensile load of 27,500 n. It must not experience either plastic deformation or a diameter reduction of more than 7. 5×10-3 mm. Of the materials listed as follows, which are possible candidates? justify your choice(s).

Which statements about the two fossil images are correct? 1. cave bears are ancestors of plateosaurus. 2. plateosaurus were present on earth before ostracoderms. 3. ostracoderms were the first to die. 4. plateosaurus died after the ostracoderms. 5. cave bears are the oldest fossils.

Which scenario describes intraspecific, indirect competition? a. a peacock defends its territory against another peacock. b. lions and hyenas compete for the same prey animals. c. a male black bear eats fish in an area of a lake, so other black bears can’t. d. different species of birds fight over spilled popcorn on the ground.

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