Which of these statements best describes a scientific theory? (2 points) It is a description of an observation which does not change over time

It is a description of an observation after research over a period of time

It is an explanation for an observation which is not based on data

It is an explanation for an observation after several valid experiments

How does photosynthesis show the conservation of mass and energy?

Jane has a sprained ankle, and her doctor gave her a prescription that states: “ibuprofen caps 200 mg tid po.” what does this prescription say, in spelled-out form?

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.