From what I have learned about stingrays... They don't exactly "sleep" But they do go in a state of awareness when they "sleep" They sleep anytime they want (its not like they can tell time lol)
<u>tracheids are not an element of phloem tissue, so the correct option is (1) Tracheids. Note: Phloem parenchyma is also a part of phloem tissue ,these cells are like ordinary parenchyma and are living.</u>
Answer:
Asteroids
Explanation:
Much of our earth's water supply comes from the asteroids.
More research done suggested that much of the earth's water is being delivered by the asteroids.
The origin of earth's water can be tracked down by analyzing the ratio of the two isotopes of hydrogen molecule. On isotope is the ordinary hydrogen and the other is the deuterium.
Research and study suggests that there is a close match between the earth water's ratio of deuterium to hydrogen to that of the asteroids, which is rich in water and elements such as nitrogen and carbon.
Thus the answer is --- "Asteroids"
Nullification, in United States constitutional history, is a legal theory that a state has the right to nullify, or invalidate, any federal law which that state has deemed unconstitutional. So the best answer among the following choices is letter C. Southern senator Calhoun and Hayne argued that Congress could not pass laws that favored one region of the country over another.
Answer:
The probability that all the officers are women is 
Explanation:
Given a committee consisting of 8 women and 12 men, from which 3 committee members are to be chosen as officers from a committee.
The total number of committee members is 8 + 12 = 20 members
C(n,r) =
which represents the number of combinations of taking r objects out of n.
The probability that all the officers are women = C(8,3) / C(20,3)
= 
=
=
Therefore the probability that all the officers are women is 