Early Romans discovered that objects could be magnified through the construction and shaping of glass. For the past thousand years, this discovery has led to the construction and design of modern day microscopes. The development Every object in the universe is made of cells.

Cells are made from atoms during chemical reactions.

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All cells are identical.
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All living things are made of cells



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The given question is incomplete. The complete question is:

All of the flower mechanisms would help prevent pollination by a foreign species except __________.

A. A pollen tube grows in the style of its own species.

B. The stigma is sticky mainly to its own species of pollen.

C. The timing of flowering keeps pollinators moving among a limited number of species.

D. Flowers attract a small number of specialized pollinators, and therefore pollen is not spread equally to all available species of flowers.

E. Flowers of different species are the same color and attract similar pollinators.

Answer:

E. Flowers of different species are the same color and attract similar pollinators.

Explanation:

Plants of different species develop various morphological, physiological and behavioral strategies to ensure that the flowers of one species are not pollinated by pollens from any other species. One such structural adaptation is the production of flowers of a different color, size and shape.

These structural distinctions allow specific pollinators to visit the flowers of the particular species only. It ensures pollens from a different plant species do not land on the flowers of some other species. Production of flowers of the same color by different plant species would attract same pollinators and may result in pollination by a foreign species.

The targets were in Africa, which is not far from the Middle East is the correct answer.

The Al-Qaida-the Islamic Militant organisation who were responsible for 9/11 attack, likely choose its first American bombing targets in Africa, which is not far from middle east, the latter being the cradle of al-Qaida.

A pure substance is any substance on its own. For example, sand is impure for containing lots of different substances. However, diamonds are mostly pure for only containing one type of substance.

Whether a substance is pure or not doesn't relate to a substance's molecular structure, but different molecules in a substance. Water by itself is only H2O, therefore it still pure.

Water is not an element but a compound for containing different elements, however it still pure.