The only reptiles that have four-chambered hearts, like mammals do, are the ________
a. tuataras
b. lizards
c. crocodilians
d. tortoises
c
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In what portion of the plant does photosynthesis takes place?
A. mesophyll B. chloroplast C. thylakoid membrane D. grana E. All of the choices are correct.
The milk of cetaceans is very rich in:
a. fat. b. protein. c. carbohydrates. d. cellulose. e. DNA.
Which of the following would result in reproductive isolation?
A. Two populations of crickets are indistinguishable in physical features, but the females in each group only come to the different songs of their males. B. One brood of the seventeen-year cicada emerged in 1987 (and will do so every 17 years) and lives a few months as adults; another brood emerged in 1992 (and will do so every 17 years); the larvae of both feed side-by-side on tree roots. C. Fruit flies on one Hawaiian island live for hundreds of generations and do not come in contact with fruit flies on another island except when blown there by rare tropical storms. D. A lion and a tiger mate in the artificial confines of a zoo but the offspring is infertile. E. All of the choices are correct.
Linen is woven from strands of sclerenchyma ________ that occur in the phloem of flax (Linum spp.).
A. sieve B. collenchyma C. sclerid D. fiber E. tracheid