Which animal has a gastrovascular cavity?
a. earthworm
b. fish
c. hydra
d. insect
e. sponge
ANSWER: c
You might also like to view...
The female genetic ancestor of all living humans:
A. lived in Africa only 10,000 years ago. B. was the only living female of her tribe. C. was identified using haplotypes on the X chromosome. D. was the only female of her tribe to have children. E. was the only female whose mitochondrial DNA has been inherited in the modern human lineage.
Answer the following statements true (T) or false (F)
1. Fungi differ from plants and animals by having the spindle remaining enclosed within the nuclear envelope during nuclear division. 2. All materials passing from one hyphal cell to another must diffuse across the septal wall. 3. Reproduction by asexual spores in fungi allows dispersal to a new location but doesn't facilitate invasion of new KINDS of habitats. 4. Conidia are sexual spores produced by mushrooms. 5. Wildlife benefit from endophytes because the endophytes cause more luxuriant plant growth.
Which of the following statements about primates is true?
a. Prosimians are typically nocturnal. b. Prosimians are larger than anthropoids. c. Prosimians have larger brains than anthropoids. d. Prosimians include monkeys, apes, and lemurs.
Which of the following statements about transmission electron microscopy is INCORRECT?
A. Two-dimensional images are produced. B. Magnets serve as lenses. C. Up to 1,000,000X magnification may be achieved. D. Living specimens may be used. E. Stains can be applied to increase electron density.