The ___ Echinoderm lineage is made up of brittle and basket stars, each with elongated, slender, somewhat snakelike
arms surrounding a well-defined central disk.
a. Echinoidea
b. Ophiuroidea
c. Crinoidea
d. Holothuroidea
e. Asteroidea
ANSWER: b
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What type of cells are joined end-to-end, conduct water and are connected to each other with strips of wall material?
A. sieve cells B. tracheids C. sieve tube members D. vessel members E. companion cells
Which of the following encourages growth of
bone and soft tissues in the young?
a. ACTH b. prolactin c. oxytocin d. growth hormone e. more than one of these encourages growth of bone and soft tissues in the young
The size of a population depends on its rates of births, deaths, __________, and __________. Fill in the blank(s) with the appropriate word(s)
Plants and algae most recently shared a common ancestor 480 million years ago, and plants colonized land shortly after that. In sexual reproduction, an alga simply releases gametes into the water, and the current carries the sex cells to another individual. What adaptation did plants have to make in reproduction when they moved to dry land?
a. Development of stomata b. Development of vascular tissue c. Production of a cuticle d. Production of pollen e. Production of lignin