The main excretory product of frog is ?
[a] urea
[b] ammonia
[c] uric acid
[d] amino acid

Which type of scientific statement is defined as a hypothesis or group of hypotheses that can be accepted as true based on the repeated experimentation with similar results

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

You are given an electron micrograph of a bacterial cell. in the micrograph you can clearly see three thin layers of different densities surrounding the cell. based on the micrograph, you can infer that this cell is and would appear after application of the gram stain procedure. gram-negative / pink gram-positive / purple gram-positive / pink gram-negative / purple