Which of the following statements is true? Humans are more complicated than crickets, so they are better organisms.
O Humans are at the top of the evolutionary ladder because we have the largest brains.
Any type of change in the shape or behavior of an organism is considered an evolution.
Macroevolutionists cannot make direct observations because most of the organisms are dead or extinct.

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.