TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: In humans, what is the first organ to form and become functional? Answer: heart

SOLUTION: In humans, the heart is the first organ to form and become functional.

PROBLEM: Question: What is a measure that has both size and direction? Answer: vector

SOLUTION: Vector is a measure that has both size and direction.

PROBLEM: Question: Within the microsporangium, the microspore mother cell divides by meiosis to give rise to four microspores, each of which will ultimately form this? Answer: pollen grain

SOLUTION:
Within the microsporangium, the microspore mother cell divides by meiosis to give rise to four microspores, each of pollen grain will ultimately form this.