Which example is a trace fossil? A:dinosaur egg

B:shark tooth

C:seashell

D:shrimp burrow

D

Explanation: Preparation revealed five types of trace fossils on the bone surfaces--shallow pits; rosettes; hemispherical pits; thin, curvilinear grooves; and U- to V-shaped grooves. Trace fossils, also called ichnofossils, do not contain information about the organism itself. Rather, they contain information on traces left by the organism. Common examples of trace fossils include burrows, nests, footprints, dung and tooth marks.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

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