Answer:
An atom that gains or loses an electron becomes an ion. If it gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion (see page 10 for more on ions).
Explanation:
I believe it would be the bending of the arm, utilizing your muscular ad skeletal system. As the joint in your elbow is cartilage part of the skeletal system, and the voluntary bending comes from the contraction of muscles in the arm.
Zooplankton communities have also changed due to zebra mussel-induced shifts in the algae food supply for these microscopic animals. "The most clear and dramatic impact of the zebra mussel on other animals has been the elimination of native clams from heavily infested areas of the Great Lakes.
Answer:
In males primary spermatocytes undergo two meiotic divisions. First meiotic division give rise to two secondary spermatocytes and secondary meiotic division give rise to four spermatids from two spermatocytes.
Therefore a. from 100 primary spermatocytes 400 sperms will develop (100*4= 400)
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b. From 100 secondary spermatocyteS 200 sperms will develop(100*2= 200).
c. Spermatids do not undergo any further division rather they undergo differentiation to form mature sperms. Therefore from 100 spermatids, 100 mature sperms will develop.
d. One primary oocyte gives rise to one secondary oocyte and one secondary oocyte give rise to one mature ova so only one mature ova will develop from 100 primary oocytes.
e. 100 ova will develop from 100 secondary oocytes.
f. Polar body do not develop into ova and degenerates after some time so no ova will develop from 100 polar bodies.
older
the deeper you dig into the earth, the farther back into history you are going.