PLEASE I NEED HELP Which quality do all good scientific designs share?

They have only one tested group.
They cannot be repeated by other scientists.
They have easily understandable language.
They ensure valid results.

they insure valid results

Explanation: took the test and got 100% it was the cumulative exam

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.