Each student in a science class of 25 performed the same experiment. Each student shares their data and it is recoded on a class data table. Tamara compared the data that she personally collected in her experiment to the
data collected by the rest of her classmates.
Which of the following might indicate to her that her results are valid?

The illustration shown is an ovum, a female sex cell. a mutation in this cell may be passed to the woman’s offspring during a) birth. b) mitosis. c) dna replication. d) sexual reproduction

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.