Benchmark 12E
Habits of Mind: Critical-Response Skills
Grades K-2, page 298

Ask "How do you know?" in appropriate situations and attempt reasonable answers when others ask them the same question.
 

NSES Content Standard A
Science as Inquiry: Abilities necessary to do scientific inquiry
Grades K-4, page 122
Use data to construct a reasonable explanation. This aspect of the standard emphasizes the students' thinking as they use data to formulate explanations. Even at the earliest grade levels, students should learn what constitutes evidence and judge the merits or strength of the data and information that will be used to make explanations. After students propose an explanation, they will appeal to the knowledge and evidence they obtained to support their explanations. Students should check their explanations against scientific knowledge, experiences, and observations of others.

NSES Content Standard A 
Science as Inquiry: Abilities necessary to do scientific inquiry
Grades K-4, page 122
Communicate investigations and explanations. Students should begin developing the abilities to communicate, critique, and analyze their work and the work of other students. This communication might be spoken or drawn as well as written.