Question

parasite relationships are often the most familiar types of symbiotic relationships. a common example is a flea living on a dog. in cases like these, the parasite gains a viable habitat to support its life cycle, while the host is harmed.

in a mutualistic relationship, on the other hand, both organisms in the relationship are better off because of their arrangement; that is, they benefit mutually from their interactions. for example, lichen is composed of two organisms, an alga and a fungus. the fungus acts like a sponge, holding on to water that the alga needs. at the same time, the alga is constantly converting sunlight into energy, so the fungus, which cannot perform this function for itself, benefits from a reliable energy source. lichen is, in turn, engaged in a commensalistic relationship with the tree that it grows on. in a commensalistic relationship, one organism benefits and the other organism neither benefits nor suffers. the tree provides lichen with a place to grow, but the tree is unaffected.

what is the meaning of viable as used in the passage?

pleasant or luxurious

able to find

Explanation:

To determine the meaning of "viable" in the passage, we analyze the context: the parasite (flea) gains a "viable habitat" to support its life cycle. A habitat that supports a life cycle must be one that allows the parasite to survive and function.

• "pleasant or luxurious" implies comfort, but the key is about supporting life, not luxury.
• "able to find" doesn't fit, as the habitat's quality (not just discoverability) is at stake.

A more appropriate meaning (not listed in the shown options fully, but if we infer from context) would relate to "capable of sustaining life" (e.g., a viable habitat is one that enables the parasite to live out its life cycle). However, among the given partial options, neither fully captures it, but if we assess the intent: the habitat must be able to support life (so "viable" here means something like "capable of sustaining" the parasite's life cycle).

Since the options provided are incomplete, but if we assume a missing option (or re - evaluate the shown ones), the intended meaning is related to the habitat being suitable for the parasite's survival. If we had to choose between the shown (incomplete) ones, neither is correct, but likely the intended answer (if options were complete) would be related to "capable of sustaining life".

(Note: The provided options seem truncated. If we assume a standard vocabulary context, "viable" in this case means "capable of working successfully; feasible" (for the habitat to support the parasite's life cycle).)

Answer:

To determine the meaning of "viable" in the passage, we analyze the context: the parasite (flea) gains a "viable habitat" to support its life cycle. A habitat that supports a life cycle must be one that allows the parasite to survive and function.

• "pleasant or luxurious" implies comfort, but the key is about supporting life, not luxury.
• "able to find" doesn't fit, as the habitat's quality (not just discoverability) is at stake.

A more appropriate meaning (not listed in the shown options fully, but if we infer from context) would relate to "capable of sustaining life" (e.g., a viable habitat is one that enables the parasite to live out its life cycle). However, among the given partial options, neither fully captures it, but if we assess the intent: the habitat must be able to support life (so "viable" here means something like "capable of sustaining" the parasite's life cycle).

Since the options provided are incomplete, but if we assume a missing option (or re - evaluate the shown ones), the intended meaning is related to the habitat being suitable for the parasite's survival. If we had to choose between the shown (incomplete) ones, neither is correct, but likely the intended answer (if options were complete) would be related to "capable of sustaining life".

(Note: The provided options seem truncated. If we assume a standard vocabulary context, "viable" in this case means "capable of working successfully; feasible" (for the habitat to support the parasite's life cycle).)