Which population of predators is potentially most stable? a population that specializes on one type of prey a population that is composed primarily of juveniles a population at its maximum sustainable yield a population that feeds on many types of prey a population that is composed of fertile adults?

The correct answer is - a population that feeds on many types of prey.

The predators that are highly versatile in their diet are usually the ones that get over through crises periods, dying out of species, natural disasters... This is due to their ability to adapt to feed on various prey animals, so they are not dependant only on one or two species for their survival. Also this type of predators have developed multiple hunting strategies, unlike the highly specialized predators.

A perfect example for this is the survival of the cougar and the dying out of the smilodon. While the smilodon was a highly specialized predator for only certain type of prey and only one hunting strategy, the cougar was and still is a predator that hunts everything from rodents to birds, and from rabbits to elks. So when a change occurred in the ecosystem, the smilodon died out because its prey died out and it was not able to feed itself, while the versatile cougar managed to survive because it was able to prey upon most of the animals and had perfected multiple hunting strategies.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.