How many significant digits are in 4,050? -1 -2 -3 -4

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Which of the following is an effect of the uneven heating of the earth by the sun? a sea breeze a land breeze a convection current all of the above

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2