False. Strontium 90 has a half life of only 30 years, and as millions of years pass, about the time fossils have been around, most if not all of any strontium would have decayed.
Answer:
D. Sulfur
Explanation:
Electrons are filled in shells. Oxygen has a total of 8 electrons while sulfur has a total of 16 electrons. Out of the total eight electrons, the first shell has two electrons while six electrons are filled in the “s and p” orbits of the second shell giving the outer shell a configuration of "2s2, 2p4".
Likewise, out of the total 16 electrons of sulfur, the last 6 electrons are filled in "s" and "p" orbits of the third shell. Sulfur has a total of six electrons in its outer most shell "3s² 3p⁴". Since the electrons present in the outer most shell are available for chemical reactions and determine the chemical nature of the atom, oxygen and sulfur should exhibit the same chemical properties.
Answer:
b. "C" “B” “A,” “D”
Explanation:
C is prophase because the nuclear envelope starts to disappear and the centrosomes divide
B is metaphase because chromosomes line up to form the equatorial plate
A is anaphase because the sister chromatids are separated
D is telophase because new nuclei form around the separated genetic material
Eukaryotes have a nucleus and prokaryotes don't
Answer:
if oxygen is not present, some organisms can undergo fermentation to continually produce ATP. Plants undergo cellular respiration
Explanation:
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