Self-study
The diet of . █████████ ████████ ████████████ ████████ ████████ ██ █████ ████ ██████ ██ ███ █████ █████████ █████ █████ ██ ███ ███████ █████████ █████ █████ ██ █████████ ██ ███ ██████ ███ ██████████ ██ ████ ███████ █████ ████ ██ █████████ █████████ ████ ██ ██ ████████ ████ ██ ████ █████████ ███ ███ ██████████ ██ █ ████████ ██████ ██████████ █████ ████ ███████████ ███████ ████ █████████ ██ █████ ███████ ██ ████████ ████ ████
Summary
Most caterpillar species have volicitin in their saliva.
If an insect produces volicitin, then it must have linolenic acid in its diet.
Many insects need linolenic acid to grow.
Physalis plants don’t contain linolenic acid.
H. subflexa caterpillars only eat Physalis plants.
H. subflexa caterpillars don’t have volicitin in their saliva.
Very Strongly Supported Conclusions
Most caterpillar species have linolenic acid in their diets.
Most caterpillar species don’t eat only Physalis plants.
Many insects can’t grow and mature if they only eat Physalis plants.
23.
Which one of the following ███ ██ ████████ ████████ ████ ███ ██████████ ██████
a
H. subflexa caterpillars ██████████ █████████ ████ ██████ █████ ███████
Unsupported. H. subflexa caterpillars don’t get linolenic acid from their diets, but this doesn’t necessarily mean that they synthesize it within their bodies. They might just not need any linolenic acid or volicitin.
b
Most species of ███████████ ████ ███████ ██ █████████ ████ ██ █████ ██████
Very strongly supported. Most species of caterpillar have volicitin in their saliva. And if an insect produces volicitin, then it must have linolenic acid in its diet. So most species of caterpillar have linolenic acid in their diets.
c
Any caterpillar that ███ █████████ ████ ██ ███ ████ ███ █████████ ██ ███ ███████
Unsupported. If a caterpillar has volicitin in its saliva, then it must have linolenic acid in its diet. But this doesn’t necessarily mean that if a caterpillar has linolenic acid in its diet, then it must have volicitin in its saliva. (C) reverses the conditional claim.
d
A food source ██████████ █████████ ████ █████ ██ █████████ ██ ██ ████████ █████████████
Unsupported. H. subflexa caterpillars only eat plants that don’t contain linolenic acid. But this doesn’t necessarily mean that plants that do contain linolenic acid are poisonous to them. They might just hatch on Physalis plants and never move to other plants.
e
No caterpillars other ████ ██ ████████ ███ █████ ████ ██████ ██ ███ █████ █████████
Unsupported. Most caterpillars have linolenic acid in their diets. But this doesn’t mean that no other caterpillars eat Physalis plants. There might be others like H. subflexa that only eat Physalis plants, or some that eat Physalis plants and other plants with linolenic acid.