Which of the following statements is true?
A) Cnidarians have no true tissues and are filter feeders, while flatworms have true tissues and a gastrovascular cavity.
B) Nematodes have no true tissues and are filter feeders, while chordates have true tissues and a gastrovascular cavity.
C) Molluscs have no true tissues and are filter feeders, while cnidarians have true tissues and a gastrovascular cavity.
D) Sponges have no true tissues and are filter feeders, while cnidarians have true tissues and a gastrovascular cavity.
Answer: D
You might also like to view...
The cytoskeleton of animal cells includes:
A. microtubules, microfilaments, and intermediate filaments. B. actin, microfilaments, and intermediate filaments. C. actin, microtubules, intermediate filaments. D. tubulin, microfilaments, and intermediate filaments. E. microtubules and microfilaments.
In your observations of a new rotifer species, you note that diploid females can lay diploid eggs that in turn become diploid female adults. What do you conclude about this behavior?
A. This is asexual reproduction by way of parthenogenesis. B. This asexual reproduction by way of budding of a new individual from the parent. C. This is sexual reproduction by way of parthenogenesis. D. This is sexual reproduction because sperm must have been stored in the female for later fertilization of her eggs. E. This is sexual reproduction by way of diploid females laying haploid eggs that hatch into haploid males who in turn produce sperm that fertilizes other haploid eggs.
In an effort to determine the mechanism of neuronal signaling, Otto Loewi isolated ____
a. frog hearts b. frog brains c. rat hearts d. rat brains e. rat vagus nerve
Glucose and fructose are different
a. in the number of carbons they possess. b. in their proportion in sucrose molecules. c. in the way that their atoms are arranged. d. in the number of double bonds they possess. e. both in the way that their atoms are arranged and in the number of double bonds they possess.