The diagram shows a football field that represents a geological time scale. why are no organisms labeled between the end zone and 30 yard line on the left side of the field? a. scientists disagree about the fossils from this time period. b. scientists have not studied that part of the time scale. c. there is very little fossil evidence for this time period. d. there are too many fossils to name.

Ithink the answer is d

What kind of enegia produces the mixture of bicarbonate and vinegar  chemical producetion

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.