Which of the following is a discriminative stimulus (SD)?
Receiving a sticker for completing a task
Receiving something to eat after saying "I’m hungry"
Saying "Match blue" and receiving a blue card
Not following a direction given by an adult

Saying "Match blue" and receiving a blue card

Explanation:

A discriminative stimulus is a stimulus like a place, people or thing which causes a forced behavior of reinforced behavior. This reinforced behavior is not necessarily observed in stimulus behavior.

In the given question, the person wanted the match for blue color (stimulus) and received a blue card (reinforcer). In this situation since the person wanted the match for the blue color and received it as well, therefore, a reinforced behavior is expected in the case as the person got what he wanted.

Thus, Saying "Match blue" and receiving a blue card is correct.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

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.