Prior to the 1970s, scientists believed that new neurons could not be generated in adult brains. in the 1970s, dr. goldman and dr. nottbohm discovered that hormones injected in adult songbirds could cause female songbirds to develop new neurons. which statement best exemplifies the scientific principal that occurred in this case? new experiments do not affect science because science remains constant. new experiments can affect future scientific explanations. new experiments can affect previous scientific explanations. new experiments yield untrustworthy data and should be carefully considered.

Which of the following lines of evidence would best support your assertion that a particular plant is an angiosperm? a) it produces seeds. b) it retains its fertilized egg within its archaegonium. c) it lacks gametangia. d) it undergoes alternation of generations.

In which layer do organisms on earth love?

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).