Which of the following statements is true regarding scientific hypotheses?
a. there are no valuable hypotheses.
b. a testable hypothesis is valuable only if all evidence supports it.
c. every hypothesis is valuable, whether or not it is testable.
d. a testable hypothesis is valuable, even if evidence shows that it is false.

Which of the following statements about hybrid orbitals is or are true? choose all that apply. choose all that apply. under sp2 hybridization, the large lobes point to the vertices of an equilateral triangle. after an atom undergoes sp hybridization there is one unhybridized p orbital on the atom. the angle between the large lobes of sp3 hybrids is 109.5∘

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a. the mitochondria b. the nucleus c. the vacuoles d. the endoplasmic reticulum

Many ionic compounds and a few highly polar covalent compounds are because they completely ionize in water to create a solution filled with charged ions that can conduct an electric current.