Air does have weight. 14.7 psi in fact. Most of the air is Nitrogen gas, which is 2 atoms of nitrogen. There is also Oxygen gas (O2). Finally there is Carbon Dioxide (CO2). There is also a small percentage of other gasses, but they are insignificant.
Answer:
The dependent variable is the student's heart rate
Explanation:
the student heart rate is what is being observed in relation to the type of music being played.
Answer:
These concerns range from ethical issues to lack of knowledge on the effects genetic engineering may have. One major concern is that once an altered gene is placed in an organism, the process cannot be reversed. Public reaction to the use of rDNA in genetic engineering has been mixed.
I don't know if that's right
Answer:
The correct answer is C: "The secretory phase of the uterine (menstrual) cycle occurs when <em>progesterone stimulates the endometrium to prepare it for implantation".</em>
Explanation:
The luteal phase, also known as a <u>secretory phase </u>or postovulatory phase, has place immediately <em>after ovulation</em>, from 15th to 28th day, and it lasts <em>until the end of the menstrual cycle</em> when bleeding starts again.
During the secretory phase, the <em>follicle</em> in the ovary <em>produces </em><em>progesterone</em> to keep <em>preparing the uterus for a possible pregnancy</em>. If there is no fecundation, estrogen and progesterone levels fall as the follicle reduces. When this happens, the endometrial is eliminated as menstruation and a new cycle begins.
<em>If the ovule is fecundated, </em><em>it occurs implantation</em><em> </em>and follicles continue to produce progesterone and estrogen in high amounts to sustain the endometrial until the placenta is formed.
