5. you have found the fossil of an ancient, extinct species. you compare it to a modern day living species that is closely related. which of the following could you reasonably expect to observe?
a) the fossil and the living species will have identical features
b) the fossil and the living species will have some similarities and some differences
c) the fossil and the living species will differ only in size
d) comparison of the fossil and the living species will reveal their common ancestor

Glucose is broken down in different ways, both in the presence and in the absence of oxygen. using the table for reference, what major products are formed in each reaction set?

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).

How do light years astronomers to determine the ages of distant objects in space ?