Question

which of the following describes a survival advantage and individual organism derives from living in a large group with other individuals of the same species?
they are less likely to contract a disease
they encounter reduce competition
they are less visible to predators
they can more easily find a mate

some birds decorate their nuts, using flowers, debris, etc., and others roll stones to the feet of their potential mates during courtship. what types of behaviors are these birds exhibiting?
these types of behaviors are examples of nest - building behavior to prepare for offspring.
these types of behaviors are examples of courting behavior for selection of mates
these types of behaviors are examples of food - hoarding behavior to store resources for later.
these types of behaviors are examples of defensive behavior to ward off predators.

Explanation:

For the first question:

• When organisms live in a large group, being in a group can make it harder for predators to single out an individual. For example, in a school of fish, it's more difficult for a predator to target one fish compared to a solitary fish.
• Regarding the second option, in a group, competition for resources like food and space can actually increase.
• For the first option, diseases can spread more easily in a group.
• For the fourth option, while finding a mate is important for reproduction, the question asks about a survival advantage.

For the second question:

• The key phrase is “during courtship”. Courtship behaviors are related to attracting and selecting mates.
• Nest - building behavior is mainly about constructing a place for offspring, not what is described here.
• Food - hoarding is about storing food.
• Defensive behavior is to protect from predators, but the context is courtship.

Answer:

First question: They are less visible to predators.
Second question: These types of behaviors are examples of courting behavior for selection of mates.