The scientist finds fossilized remains of other species in the same rock layer as the trilobite. what can the scientist conclude about these other fossils? a. the organisms that formed them must have evolved from trilobites. b. the organisms that formed them likely also lived during the paleozoic era. c. the organisms that formed them are still living in modern times. d. the organisms that formed them likely went extinct before the paleozoic era.

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."