In angiosperms, what is the male gametophyte?
A) Pollen B) A flower C) The anther D) Sperm E) A seed
A
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It is thought that the first multicellular organisms arose about _____ years ago.
A. 6 billion B. 1.2 billion C. 3 billion D. 500 million E. 3.5 billion
Fish populations can decline due to the introduction of ________ species.
A) invasive B) endemic C) native D) pandemic
A mammal is _____ and has a body temperature _____.
What will be an ideal response?
The state of California has several large cities and very productive croplands that divert and use large amounts of water from rivers. What is one damaging effect of this use of water from the rivers?
A. increased amounts of solid waste pollution in the oceans B. decreased amounts of fresh water in marshes and estuaries C. changes in local rainfall amounts D. changes in upstream water tables