Answer:
The correct answer is -
The control group: the group of people with no supplements and kept inside.
The dependent variable: Vitamin D level in all groups.
The independent variable: the source of vitamin D (sun or tablets)
Explanation:
The control group of any experiment is the group of subjects that did not receive any type of treatment or did not manipulate by the independent variable. Here the group of 30 people that kept inside and did not get supplements is the control group.
The independent variable is a variable that directly affects the dependent variable by a change in the independent variable. In this experiment, the sunlight and vitamin D tablets are independent variables that affect the vitamin D level in people.
The dependent variable is a variable that is affected by the independent variable or depends on the independent variable, vitamin level is the dependent variable.
Answer:
An exoskeleton is a hard outer layer that protects an animal's soft insides.
Explanation:
hope this helps :)
I would make a spray that is not harmful to the environment, but instead it kills mosquitoes. If any other animals eats this, they will not die. It is for mosquitoes specificly.
The correct answer would be true. Petroleum and coal are mostly mined from the continental shelf. Most of the oil rigs are found and situated in this area. Gas/oil deposits are found in these areas since the ocean floor is known to exist a 100 million years ago which means deposits and fossil fuels are formed all through out those years.
