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Spicules are

Developers are building ten new homes on a parcel of land of one habitat type. Local zoning regulations require that they leave some of the land in its natural condition to conserve native species. They can set aside either one large plot or five small separated plots. The total amount of conserved area is the same in either case. Which choice, if either, would be best for maintaining biodiversity, and why?

Which group of animals is endothermic?

Sexual dimorhism, as seen in the crayfish, is

The island of Madagascar, off the southern African coast, has a highly unique endemic biota. Roughly 170 million years ago, Madagascar was landlocked in the middle of the supercontinent Gondwana. Gondwana eventually split by continental drift, forming Africa, South America, India, Australia, and Antarctica. For the past 88 million years, Madagascar has been isolated, but some new species can still reach the island from the coast of Africa. This suggests that the evolution of Madagascar’s unique biota is

The dominant generation in vascular plants is the ______.

Roots and shoots lengthen through activity at ________.

Most producers are this particular type. 

All of the following characteristics are true about sea anemones except

The insects were the first organisms to