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2 years ago

Which of these elements are the least dense?

Biology

2 answers:

boyakko [2]2 years ago

5 0

The answer is oxygen and silicone

Gennadij [26K]2 years ago

3 0

The first one because just think about how light oxygen or air is

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The _____ nervous system contain(s) the sensory and motor neurons connecting the CNS to the rest of the body.

devlian [24]

Answer: The correct answer is peripheral

Explanation:

The Peripheral nervous system consists of the following:

- sensory neurons, which leads all parts of the body to the central nervous system

- motor neurons that runs the central nervous system to all parts of the body.

Thus, Peripheral nervous system is the answer

5 0

2 years ago

Ent var

jok3333 [9.3K]

Answer: Oxygen

Explanation:I hope it helps . i have breifly explained it .

Oxygen gas is one of the products of photosynthesis.

Which reactant is the source for oxygen gas and how is it released?

A .

Water, released when sunlight splits it into oxygen and hydrogen ions

B .

Glucose, released when glucose is broken down into carbon dioxide gas, oxygen gas and water

C .

Carbon dioxide, released when sunlight splits it into carbon and oxygen gas

D .

Electrons, released when they strike the chloroplasts

Green plants capture energy and convert it into chemical energy by the process known as photosynthesis. During photosynthesis, carbon dioxide and water are transformed into simple carbohydrates and oxygen is liberated into the atmosphere.

light

6CO2 + 12H2O ----------------> C6H12O6 + 6O2

chlorophyll

Water is also used as a source of hydrogen required for reduction of carbon dioxide to form carbohydrate.

Water is oxidised in presence of light and chlorophyll. Hydrogen is removed from water and oxygen is released as follows:

light

4‎H20 ---------------> 2‎H20 + 4H+ + 4e− + O2

chlorophyll

or,

2‎H2O ----------------> 4H+ + 4e− + O2

Hence the source for oxygen gas is water and it is released when water splits in the presence of sunlight into oxygen and hydrogen ions.

So, the correct answer is 'Water, released when sunlight splits it into oxygen and hydrogen ions'.

4 0

3 years ago

Which statements are accurate about earthquakes that occur during the formation of a chain of islands and seamounts by a hotspot

Westkost [7]

Answer:

The following are accurate about earthquakes which occur during the formation of a chain of Islands and seamounts by hotspots:

- Earthquakes occur along fault lines within volcanoes formed by the hotspot.

- Earthquakes occur along fault lines during plate movements.

- Earthquakes occur when Earth’s crust bends under the weight of islands formed by the hotspot.

Explanation:

8 0

2 years ago

A biochemist isolates and purifies various molecules needed for DNA replication. When she adds these molecules to DNA, replicati

olga55 [171]

Answer:

DNA ligase

Explanation:

<em>The biochemist must have left out DNA ligase enzyme.</em>

<u>The DNA ligase enzyme is able to catalyze the formation of phosphodiester bonds and as such, capable of joining strands of DNA together to form a single strand.</u>

The numerous DNA segments of a few nucleotides long observed by the biochemist must have been the replicated product of the lagging DNA strand. The lagging strand is replicated discontinuously in short strands because the DNA polymerase enzyme can only elongate primers in 5' to 3' direction. The short segments are known as Okazaki segments and are usually joined together to form a whole strand by the DNA ligase enzyme.

Hence, the missing component is the DNA ligase.

3 0

2 years ago

How do you think scientists count the world’s human population?

ArbitrLikvidat [17]

Answer:

Scientist count the world humans population with an organization called The United Nations Population Division (UNPD),

Explanation:

Which keeps track of the world population, projects that the world's human population will hit 7 billion on Halloween Day 2011. Admittedly, that is just an estimate: There's no way to know exactly how many people are alive at any given moment, and the true date that humanity's ranks will surpass 7 billion could come in the weeks or months before or after Oct. 31. Nonetheless, the UN's guess is the best there is.

4 0

3 years ago