The diagram shows the rock layers of two mountains, labeled A and B. The two mountains are located thousands of kilometers apart, on different continents. Both mountains have a layer of limestone, as shown by the labels. A scientist analyzes a fossil found in the limestone layer of Mountain A. By applying the technique of radiometric dating to the fossil, the scientist concludes that the limestone formed approximately 1.34 billion years ago. Which two assumptions are necessary to support the scientist's conclusion? Select the two correct answers.
A. After the fossil formed, all of its radioactive isotopes decayed very quickly.
B. Radioactive isotopes decay at a constant rate over long spans of time.
C. The fossil formed at the same time as the limestone surrounding it.
D. The fossil formed from the same materials as the limestone surrounding it.
E. After the limestone formed, chemical and physical processes affected it only minimally.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

by drinking easy

very easy

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.