a
grazing
b
logging
c
shipping
d
agriculture
Question 2
Which of the following is a natural disaster that can have a significant impact on human populations?
a
volcano
b
all of the above
c
earthquake
d
hurricane
Question 1: Shipping
Question 2: All of the Above
Answer:
Exercising
Explanation:
This happens because, when you exercise, the blood vessels in your muscles dilate (vasodilation) and as a consequence, the rate of blood flow is faster. The increased blood flow delivers more oxygenated blood to the working muscle.
B. are valid because he controlled all of the variables in week 1.
C. are valid because he designed his experiment correctly.
D. are not valid because he should not have grown the plants in identical environments.
Answer:
A
Explanation:
are not valid because one of the variables was not controlled during week 2.
Answer:
A
Explanation:
The quality and strength of data collected during a scientific investigation are based on how well the experiment was designed and executed. Although Manuel's experiment was correctly designed, he forgot to water one of the tomato plant groups during the second week. This means that his results are not valid because one of the variables was not controlled during week 2.
B) The earth forms, multicellular organisms appear, prokaryotes appear, eukaryotes appear.
C) The earth forms, prokaryotes appear, eukaryotes appear, multicellular organisms appear.
Answer:
The correct option is C. The earth forms, prokaryotes appear, eukaryotes appear, multicellular organisms appear.
Explanation:
There are many theories made by scientists which explain the formation of the planet Earth and many other theories describe the formation of life on this planet. Some theories claim that the Earth was formed from the Sun and eventually it began orbiting around the Sun. The location of the Earth from the Sun was best for the formation of life on Earth.
Some hypothesis claim that life started on Earth in extreme heated conditions known as hydrothermal vents. Prokaryotic organisms were the first to get evolved. Some prokaryotic organisms engulfed smaller prokaryotes and gave rise to eukaryotes. These eukaryotes over time formed multicellular organisms.
Answer:
C. The earth forms, prokaryotes appear, eukaryotes appear, multicellular organisms appear.
Explanation:
Explanation:
.It can form polymers like carbohydrates, lipids, proteins, and nucleic acids.
.It can regulate temperature.
.Decomposition of molecules can occur readily, releasing needed energy.
Answer:
Option C, It can regulate temperature
Explanation:
Carbon atom is able to form bonds with other carbon atoms or atoms of hydrogen , oxygen , nitrogen , phosphorus etc. A carbon forms a diamond/graphite when it joins cohesively while they form molecules like hydrocarbons, CO2 etc, when it joins adhesively with other than carbon atoms. Thus Option A is incorrect
Since carbon combines with other chemical atoms to form polymers, lipids , proteins etc, as they are adhesive to other than carbon atoms. Option B is also incorrect.
Option C, is a physical phenomena in which carbon compounds do not allow heat to escape from earth and in this way it regulate the temperature of earth. This is not an internal property of carbon and hence option C is correct.
Option D is incorrect as carbon can be easily decomposed along with production of energy by decomposers or by burning the fuels containing carbon.