A. cell division or <span>b. cell fractionation
</span>
Place is one of the five themes of geography that describes the features that make a site unique such as paris, france has the eiffel tower and the arc de triumph. In addition, the five themes of geography are location, place, region, movement and human environment interaction.
Extinction of species reduces the number of different species in ecosystems, hence lowering the diversity of living things.
Answer:
D. Cellular respiration releases oxygen and photosynthesis releases carbon dioxide
Answer:
Constant variables
Explanation:
Elaina's investigation lacked the critical ingredient of constant variables which are important components of every scientific investigation. In every research, there are 3 important variables, namely:
1. Dependent variables: the actual variable to be measured during the course of investigations and whose values are dependent on another variable (independent variable) supplied by the investigators.
2. Independent variable: one of the variables that are supplied by investigators whose values are often manipulated to see the kind of changes it will cause to the dependent variable.
3. Constant variables: other variables that are neither independent nor dependent but constant for all the various experimental groups in investigations.
