What did einstein believe regarding human perception

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays