Question

explanations is science must be testable and have

Answer 1

Evidence.

This are the two things explanations need: testability and evidence. Both of them are very important but evidence, I'd say, is the most important factor since it supports the claim in a remarcable way.

Hope it helped,

BioTeacher101

Answer 2

Answer:

Explanations in science must be testable and have evidence

Explanation: