A characteristic of animals is that they are __________ and have their cells organized into
__________.
Fill in the blank(s) with the appropriate word(s).
multicelled; tissues
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When one oxygen atom shares two pairs of electrons with another oxygen atom, O2 is formed via a(n)
A. single covalent bond. B. double covalent bond. C. triple covalent bond. D. ionic bond. E. hydrogen bond.
Heterospory refers to having ____
a. both male and female gametes b. two types of spores in two different types of sporangia c. both male and female parts on the same plant d. separate male and female plants e. both sporophyte and gametophyte generations
Which of the following statements about protists is false? a. Protists constitute a monophyletic group
b. Some protists are more closely related to plants, fungi, or animals than to other protists. c. Some protists are multicellular and have differentiated cells. d. Certain protists can function both as autotrophs and heterotrophs.
Land was first colonized about ________ years ago
A) 100 million B) 500 million C) 1.7 billion D) 2.5 billion