A farm pond, normally dry throughout winter, has loads of water and aquatic pond life in the course of the summer season. One summer season, Sarah returns to the household farm from school. Observing the pond, she is fascinated by some six-legged organisms that may crawl about on submerged surfaces or, when disturbed, seemingly “jet” by means of the water. Watching additional, she is ready to conclude that the “thriller organisms” are ambush predators, and their prey consists of all the things from bugs to small fish and tadpoles.

Sarah had discovered that ancestral (Carboniferous period) dragonfly species had been a lot bigger than extant dragonfly species are, with wingspans of 70 cm. This struck her as odd, as a result of she had additionally discovered that one of many issues that retains bugs small is their comparatively inefficient respiratory system. Which two hypotheses may assist account for the massive dimension of ancestral dragonflies?

1. If the environment in the course of the Carboniferous had featured a better oxygen content material than the trendy environment, then tracheae may need been ample means for oxygen supply to the inside tissues.

2. If massive dimension was a downside, then the massive dragonflies underwent extinction, which explains why all extant dragonflies are smaller.

3. If the ancestral dragonflies had possessed muscle tissues that permitted efficient air flow of the tracheae, then the tracheae may need been ample means for oxygen supply to the inside tissues.

4. If ancestral dragonflies existed throughout greenhouse situations, then they will need to have survived by reducing their exercise ranges, now not capturing prey in flight. Thus, for them, an ineffective respiratory system was ample.

A. 1 and 4

B. 1 and a couple of

C. 2 and three

D. 2 and 4

E. 1 and three

query 2

An elementary college science trainer determined to enliven the classroom with a salt-water aquarium. Understanding that salt-water aquaria might be fairly a problem, the trainer proceeded stepwise. First, the trainer conditioned the water. Subsequent, the trainer determined to inventory the tank with numerous marine invertebrates, together with a polychaete, a siliceous sponge, a number of bivalves, a shrimp, a number of sea anemones of various varieties, a colonial hydra, a couple of coral species, an ectoproct, a sea star, and several other gastropod varieties. Lastly, some vertebrates – a parrotfish and a clownfish – had been added. She organized for every day feedings of copepods and feeder fish.

In the future, little Tommy (a scholar in an under-supervised class of 40 fifth graders) received the urge to pet Nemo (the clownfish) who was swimming among the many waving petals of a fairly underwater “flower” that had an enormous gap within the midst of the petals. Tommy giggled upon discovering that these petals had been sticky feeling. Just a few hours later, Tommy was within the nurse’s workplace with nausea and cramps. Microscopic examination of his fingers would most likely have revealed the presence of

A. spines.

B. spicules.

C. nematocysts.

D. a radula.

E tooth marks.

query 3

An elementary college science trainer determined to enliven the classroom with a salt-water aquarium. Understanding that salt-water aquaria might be fairly a problem, the trainer proceeded stepwise. First, the trainer conditioned the water. Subsequent, the trainer determined to inventory the tank with numerous marine invertebrates, together with a polychaete, a siliceous sponge, a number of bivalves, a shrimp, a number of sea anemones of various varieties, a colonial hydra, a couple of coral species, an ectoproct, a sea star, and several other gastropod varieties. Lastly, some vertebrates – a parrotfish and a clownfish – had been added. She organized for every day feedings of copepods and feeder fish.

The species within the aquarium that possess true bilateral symmetry embrace the

1. sponges.

2. molluscs.

3. echinoderm.

4. sea anemones.

5. ectoprocts.

A. 2, 3, 4, and 5

B. 2 and 5

C. 2 solely

D. 1 and 4

E. 2, 3, and 5

query 4

An elementary college science trainer determined to enliven the classroom with a salt-water aquarium. Understanding that salt-water aquaria might be fairly a problem, the trainer proceeded stepwise. First, the trainer conditioned the water. Subsequent, the trainer determined to inventory the tank with numerous marine invertebrates, together with a polychaete, a siliceous sponge, a number of bivalves, a shrimp, a number of sea anemones of various varieties, a colonial hydra, a couple of coral species, an ectoproct, a sea star, and several other gastropod varieties. Lastly, some vertebrates – a parrotfish and a clownfish – had been added. She organized for every day feedings of copepods and feeder fish.

If the trainer wished to point out the scholars what a lophophore is, and the way it works, the trainer would level out a feeding

A. sponge.

B. bivalve.

C. ectoproct.

D. gastropod.

E. hydra.

query 5

An elementary college science trainer determined to enliven the classroom with a salt-water aquarium. Understanding that salt-water aquaria might be fairly a problem, the trainer proceeded stepwise. First, the trainer conditioned the water. Subsequent, th

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