Components typical of plant cells but not of animal cells are
(a) nuclei.
(b) cell walls.
(c) mitochondria.
(d) ribosomes.
(b) cell walls.
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If you were analyzing tree rings, how might you distinguish between fires that occurred in the spring versus fires that occurred in the summer (assuming the fires left fire scars)?
What will be an ideal response?The anglerfish obtains food by
a. catching the fish with its appendages. b. emitting a scent into the water. c. swimming to the surface. d. inverting its stomach. e. luring the fish near its mouth.
Scientists are now grouping reptiles with birds and mammals because they are all vertebrates that have a(n):
a. divided brain. b. amniotic egg. c. mammary gland. d. jointed appendage. e. epidermal covering.
On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united. Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences. Which type of reproductive isolation operates to keep the mosquitofish isolated, even when fish from different ponds are reunited in the same body of water?
A. mechanical isolation B. gametic isolation C. temporal isolation D. behavioral isolation E. habitat isolation