___culture contains only a single kind of an organism, whereas a mixed culture contains or more kinds of organisms. A _ culture contains a desired organism but also unwanted organisms.

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

b. climate change will cause an increase in biodiversity of all ecosystems.

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the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.

answer(isometric);