What best describes base groups?

Base groups are best described as heterogeneous in composition. This means that they are designed to include students with diverse backgrounds, abilities, skills, and interests. The purpose of having a heterogeneous composition is to foster a rich and varied learning environment where students can learn from one another, share different perspectives, and collaborate effectively.

Having a mix of students can encourage peer support, enhance social skills, and promote inclusivity within the classroom. By combining various individuals, base groups can address a wider range of student needs and facilitate cooperative learning experiences. This diversity is crucial for creating a classroom atmosphere conducive to growth and development, as it allows students to engage with different viewpoints and learn from their peers' experiences.

The other descriptions, such as being homogeneous, temporary, or exclusive to high-achieving students, do not capture the essence of what a base group is intended to accomplish.