Answer:
The study is an observational study because the researcher is simply collecting data from the students.
Explanation:
This case is an observational study since the medical investigator is observing and comparing individuals regarding a difference in systolic blood pressure levels between males and females.
For the study to be an experiment, the researcher should do an intervention on the students, to then collect data and study the effects of it. Also, he should group the students by chance to properly conduct an experiment.
b. a volcano erupts on a small island in the pacific ocean
c. a valley forms between two seafloor plates as they pull apart
d. two continental plates push against each other to form a mountain range
Answer:
d. two continental plates push against each other to form a mountain range
Explanation:
Converging plate boundaries occur when plates converge, that is, when they collide. The more dense plate dives over the less dense generating an area of intense magmatism. There are three types of convergence:
Convergence of two oceanic plates: When there is a collision between these two, the coldest, dense, ancient and thick plate, dives under the other, carrying part of the sediments accumulated on it. These sediments will fuse together with subduction ocean crust, generating intense volcanic activity, forming volcanic arcs or island arcs. Example: Mariana trenches, islands of Japan, etc.
Convergence of two continental plates: When there is a collision between two continental plates, the densest one dives over the other generating an intense metamorphism, that is, great mountain ranges. Example: Himalayan mountain range.
Convergence of a continental plate and an oceanic plate: When a collision occurs between these two plates, one oceanic and the other continental, it will cause the subduction of the continental plate, producing a continental magmatic arc or an abyssal pit at the edge of the continent. Example: Andes Mountains, Peru-Chile Fossa, respectively.
Accordingly, we can conclude that the letter D is the correct answer to your question.
The right answer is C) Make sure electrical hazards are resolved immediately.
The different electrical risks are:
Risk of direct contact with an electrified part
Risk of indirect contact with a conductive part accidentally switched on
Risk of "remote" electrification (without contact), by priming
Risks of fire and exposure, due in particular to arcing during a short circuit, and the accumulation of static electricity causing sparks.
To stay safe around electricity, Ted needs to avoid touching any wires that are currently attached to the outlet. This is to avoid any contact and sudden shock since the human body is composed of water which is a viable conductor of energy.
True statements: A (Water is made up of atoms bonded to form molecules) and D (The chemical formula for water is H₂O).
False statements: B (Water contains half as many hydrogen atoms as oxygen atoms) and C (Water molecules tend to push away from each other)
Let's examine each statement to determine its accuracy:
A) Water is made up of atoms bonded to form molecules.
True: Water is indeed composed of molecules. Each water molecule consists of two hydrogen atoms covalently bonded to one oxygen atom, forming the H₂O molecule.
B) Water contains half as many hydrogen atoms as oxygen atoms.
False: The chemical formula for water, H₂O, indicates that there are two hydrogen atoms for every one oxygen atom in a water molecule. Therefore, water contains twice as many hydrogen atoms as oxygen atoms.
C) Water molecules tend to push away from each other.
False: Water molecules exhibit a property called cohesion, where they are attracted to each other due to hydrogen bonding. This attraction causes water molecules to "stick" together rather than push away from each other. It's why water forms droplets and has a relatively high surface tension.
D) The chemical formula for water is H₂O.
True: The chemical formula H₂O accurately represents the composition of water, indicating that each water molecule consists of two hydrogen atoms and one oxygen atom.
The structure of water involves H₂O molecules, with each molecule consisting of two hydrogen atoms and one oxygen atom, and water molecules exhibit cohesion due to hydrogen bonding, causing them to attract and stick together.
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The question probable may be:
Which of the following statements are true and false about water's strucutre.
A) water is made up of atoms bonded to form molecules.
B) Water contains half as many hydrogen atoms as oxygen atoms.
C) Water molecules tend to push away from each other.
D) The chemical formula for water is H₂O.
Answer:
Lesson 2: Energy Roles of Organisms
Explanation:
1. B. They both produce carbohydrates
2. B. They both obtain energy by consuming other organisms.
3. C. Carnivore, Consumer
4. A. A decomposer breaks down organic compounds in dead organic matter, and a detritivote eats dead and decaying mater.
Answer:
The statement, that is, the fossil record does not contain any fossil remains of plants, only animals is false.
Explanation:
Any trace of past life is termed as the fossil. It can be an organism's remains like shells, plants, bones, or teeth. Any activity of an organism like burrows, footprints, and feces can be known as a fossil record. Five different ways by which the formation of a fossil takes place are natural casts, permineralization, trace fossils, amber preserved, and preserved remains.
The formation of a fossil distinctly takes place, however, the majority of them formed when an animal or plant dies in a watery environment and gets buried underneath the silt and mud. In the process, the soft tissues quickly get decompose and leave behind the shells or hard bones. With time accumulation of sediments takes place over the top and solidifies into a rock.