Question 4 1 pts Which of the following is true of asteroids? (Hint: Recall the video of an starfish eating a mussel.) A. a unified skeleton B. no madreporite C. respiratory trees D. eversible stomach E. Aristotles's lantern

If one of the planets in our solar system averages 0.3871016 astronomical units from the sun, what is its orbital period (in Earth years, with one year = 365.256 Earth days)? the square root of (0.3871016)3 = 0.240845 Earth years the cubic root of (0.3871016)2 = 0.531149 Earth years the square root of (0.3871016)1/2 = 0.788781 Earth years the cubic root of (0.3871016)1/2 = 0.853698 Earth years the cubic root of (0.3871016)1/3 = 0.899918 Earth years

33 of 48 A radioisotope is all the following except an isotope with different number of neutrons from others a chemical that either glows in the dark or releases heat an unstable isotope that eventually changes into a different element a chemical that gives off radioactivity

what are trace elements? Explain what happens if there is a lack of trace element in our body wiyh exmple.

Many radioactive isotopes are used in medicine for imaging and treatment purposes. The specific isotopes used depends on the particular organ or body system being studied (for example, Xe-133 is used to image lung function and blood flow.) Technetium-99m is a common radioactive isotope using for a variety of medical applications.  It is produced from the decay of Molybdenum-99 and has a half-life of 6.01 hours. What are some of the applications of Tc-99m? While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73 hours.  If it were easier to harvest, would this be a good substitute for Tc-99m? (remember to explain why for full credit) While Tc-99m has a half-life of 6.01 hours, its decay product has a half-life of 213,000 years.  While the medical community considers it to be reasonably safe, within the limits of testing, does this make sense considering both chemical and biological principles? What are possible ways that you might deal with or…

Using the Pythagorean theorem, either with or without the formula proposed by Archimedes (or by Heron), calculate the area of a scalene triangle with sides of 9 meters, 12 meters, and 15 meters. 15 meters2 36 meters2 54 meters2 60 meters2

According to Isaac Newton, if the distance between Earth and the moon were to triple or increase three-fold (increasing from 240,000 to 720,000 miles), then the gravitational force between them would: increase three-fold from its present value increase nine-fold from its present value remain the same as its present value decrease to one-third of its present value decrease to one-ninth of its present value

How is the intrinsic variable star studied and observed?

A molecule of water is formed when one atom of oxygen is covalently bonded with two atoms of hydrogen. What is the total number of electron pairs that must be shared between the oxygen atom and the hydrogen atoms in order to complete the outer electron shell of all three atoms? a.2 b.3 c.4 d.1 e.5

How did the French chemist Antoine Lavoisier explain his discovery that metals roasted in the presence of atmospheric air weighed more than unroasted metals? metals were combining with hydrogen sulfide gas to form metal sulfides metals were combining with nitrogen gas to form metal nitrides metals were combining with hydrogen gas to form metal hydrides metals were combining with carbon to form metal carbides metals were combining with oxygen gas to form metal oxides