The water cycle describes how water ervaporates from the Earth and rises into the atmosphere which cools cluads to caue rain or snow in the clouds to affect the temperature as well. This cools and changes to a liquid.
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.
Answer:
Many of these creatures have special pigment cells called chromatophores in their skin. By controlling the size of the cells they can vary their color and even create changing patterns. Chromatophores are connected to the nervous system, and their size is determined by muscular contractions.
<span>rate of technological progress. The steady-state growth rate of total output is equal to the rate of population growth (n) plus the rate of technological progress (g). A change in the rate of technological progress will permanently change the growth rate of total output. </span>