What is the name of the paired excretory organs found in most body segments of segmented worms?
a. parapodia
b. metanephridia
c. setae
d. clitella
Answer: b. metanephridia
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Playing catch with your young son, you blithely mention, “Wow, you must have excellent Ruffini endings.” He replies, “No, Mommy! My Ruffinis are beginnings!” Both of you laugh, but you explain that Ruffini endings are very helpful to humans catching balls. How do they help?
a. They detect impact stress, like when a ball hits a hand or glove. b. They detect pain when a ball hits the hand hard enough to hurt. c. They detect skin stretch and deformation in joints, allowing for object gripping. d. They detect deep pressure such as one feels when gripping a ball hard preparing to throw.
Which method of reproduction posed a challenge for clam and oyster fishery workers who thought that cutting predatory sea stars into parts would kill them, but only increased the number of sea stars?
a. Fragmentation b. Fusion c. Budding d. Fission
When describing food webs, the term "everything is connected to everything" is fitting. Why?
a. Decomposers break down organic material from all organisms. b. Animals in an ecosystem share resources. c. Producers are always at the first trophic level. d. Each species in a food web is typically two links away from all other species. e. Extinction of any species in a food web has a very low potential impact on other species.
The list below contains steps for the life cycle of Australian sheep blowflies. They are in random order, and some may be incorrect. Which sequence places the correct steps in the correct order?
1. egg 2. pupa 3. larva 4. tadpole 5. adult a. 1, 2, 4, 5 b. 1, 3, 2, 5 c. 1, 3, 4, 5 d. 1, 2, 3, 5