I believe the answer is: proximodal trend
Proximodal trend refers to the period when children started to develop more specific muscle/ motor skills.
For people in general, our upper body tend to be developed at much faster rates compared to our lower body, which cause infants having to crawl first before they are able to walk.
Answer:
D. generally much more expensive to produce than water produced using other methods
Explanation:
Producing freshwater through desalination usually being done for water that's taken from the sea. The water from the sea contains high amount of sodium, which will be unconsumable before we extract the sodium content. Desalination is the term for the process to extract that sodium.
This process is expensive. Typically, The desalination process could cost the producer around $0.13MM to $0.40MM per thousand 
/day. Taking fresh water from other sources (such as clean river) will completely overlook this additional cost.
Richard has conducted a study in which he compares the reading skills of six- year-olds, seven-year-old, and eight-year-olds-<u>They use one-way ANOVA Test</u>
Explanation:
The one-way analysis of variance also known as the ANOVA test is used to determine if there is any any statistically difference between the means of two or more independent or unrelated groups/variables
It is to be noted that there has to be minimum three groups rather than two groups
<u>The One-Way ANOVA is commonly used to test the below mentioned data's </u>
- To measure the statistical differences between the means of two or more groups.
- To measure the statistical differences between the means of two or more interventions.
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To measure the statistical differences between the means of two or more scores
