Which of the following best explains the “explosion” of fossils observed during the cambrian period? the first animals to have hard, preservable parts (shells and exoskeletons) evolved during the cambrian an extinction event destroyed nearly all fossils that existed at the end of the vendian period a mass migration at the end of the vendian period localized species in a more concentrated area the gradual warming of the climate during the cambrian period encouraged the proliferation of species

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. label the following topographic map. click on a label below the map to select it, and then click on the appropriate box on the map to place the label. (increments for contour lines is 50 ft).

45 points how are people today being protected from tsunamis? earthquake data is analyzed to detemrine if a tsunami is likely, and if so, warnings are sent out. areas in tsunami risk zones are no longer heavily populated. radar is used to measure wave heights regularly. meteorologists study the winds to determine if wave heights will be large.

Describe how a non-resistant staphylococcus aureus bacterium can produce a bacterium that is resistant to methicillin