While exploring a coal mine, scientists found plant fossils in the ceiling of the mine which had been preserved by an earthquake. samples taken from one of the fossils have carbon-14 activities of 40.0 counts/min. a reference sample of the same size, from a plant alive today, has a carbon-14 activity of 160.0 counts/min. if carbon-14 has a half-life of 5730 years, what is the age of the plant fossil in years?

i was thinking 4.0 v hope this

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.