Fish are thought to have descended from ostracoderms.

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Answer 1
Answer: not true fish was created from god but scientist believe it was evolution which inspired the existence

Related Questions

what name is given to the membrane potential that must be reached in order for an action potential to be triggered?
Which of the following is the job of RNA?A. unraveling DNAB. manufacturing nucleotides C. carrying genetic informationD. giving shape to chromosomes
Weasels eat arctic hares, which is the predator
Animal cells contain all of the following structures EXCEPT a A) nucleus. B) cell wall. C) mitochondria. D) Golgi apparatus.
Which of the following sources makes the greatest contribution to the dry mass of organic matter of an oak tree? Saved A) Endosperm that is located in acorns. B) Organic molecules from decaying matter in the soil that are taken up by the roots. C) Light that is absorbed by the chloroplasts of leaf cells. D) Water that is taken up by the roots and carbon dioxide from the air. E) Mineral nutrients dissolved in groundwater that are taken up by the roots

Earth’s continents are constantly in motion because they sit on top of gigantic plates which float on Earth’s mantle. Energy from the Earth’s core creates convection currents in the molten layer, and the currents move the plates. Over extremely long periods of time, this movement creates new _______. a. biomes b. plates c. atmospheric layers d. elements

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The correct answer is A. Biomes.

Earth’s continents are constantly in motion because they sit on top of gigantic plates which float on Earth’s mantle. Energy from the Earth’s core creates convection currents in the molten layer, and the currents move the plates. Over extremely long periods of time, this movement creates new biomes.

The continents of the Earth are constantly in motion . The reason for this motion is the position of the tectonic plates over the mantle of the Earth. The movement of these plates, causes the continents to move. Over the time, these movements becomes substantial and the drifting of the continents is visible. This leads to the formation of the new biomes. The flaura and fauna changes with these movements.

Hence, the correct answer is 'Option A - Biomes'.

What is the RNA sequence that will be formed from the DNA sequence: GGCTATTC?a. GGCUAUUC
b. CCGAUAAG
c. CCGUAUUG
d. CCGTUTTG

Answers


The correct answer is B.

According to base pairing rules, A will always pair with T and and G will always pair with C.  This pairing happens in DNA.

When it comes to RNA, there is a slight difference. Thymine is never found in RNA but is replaced with Uracil. So instead of Adenine pairing with Thymine, it will be Uracil which takes the place of Thymine.

It is important  to note that  Thymine in DNA will  code for Adenine in RNA because Adenine is found in RNA  base sequence.  However whenever Adenine in DNA wants to code for a complementary base  to copy on RNA, then Adenine will call for Uracil, not Thymine.


Which property of muscle tissue gives it the ability to contract and relax?

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Final answer:

Muscle tissue has the ability to contract and relax due to its property of excitability, which allows muscle cells to respond to stimuli and generate electrical signals. This contraction and relaxation are initiated by action potentials and the release of ATP (adenosine triphosphate) in muscle fibers. After contraction, relaxation occurs by removing calcium ions from the muscle fibers.

Explanation:

The ability of muscle tissue to contract and relax is due to its unique property called excitability. Excitability refers to the ability of muscle cells, also called muscle fibers, to respond to stimuli and generate electrical signals. These electrical signals, known as action potentials, are responsible for initiating the contraction and relaxation of muscle tissue.



When a muscle fiber receives a stimulus, it releases calcium ions and generates an action potential. This action potential spreads along the muscle fiber, resulting in the release of stored energy in the form of ATP (adenosine triphosphate). This energy is used by the muscle fibers to convert chemical energy into mechanical energy, leading to muscle contraction.



After contraction, muscle fibers need to relax. This relaxation process involves the removal of calcium ions from the muscle fibers, allowing them to return to their resting state. The ability of muscle tissue to contract and relax enables it to perform essential functions such as movement, posture maintenance, and organ control.

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Final answer:

The key property of muscle tissue that allows it to contract and relax is contractility. Muscles also have the properties of extensibility and elasticity which allow them to stretch or extend and return to their original length respectively. The functionality of these properties is seen across three types of muscle tissue: skeletal, cardiac, and smooth.

Explanation:

The property of muscle tissue that gives it the ability to contract and relax is known as contractility. This property allows muscle tissues to pull on their attachment points and shorten with force. In addition, muscles have two other notable properties, specifically, extensibility and elasticity. Extensibility enables a muscle to extend or stretch, while elasticity allows the muscle to return to its original length after it has contracted or stretched. These three properties work in combination to facilitate the smooth movement of muscles.

Three types of muscle tissue exist in the human body: skeletal, cardiac, and smooth muscle. Skeletal muscle is primarily responsible for voluntary movements, cardiac muscle causes the heart to beat, and smooth muscle is involved in involuntary movements such as the contraction of our pupils in bright light or the peristaltic movements in our intestines.

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Plants produce which of the following as waste products?carbon dioxide and oxygen
carbon dioxide and uric acid
oxygen and urine
carbon dioxide and urine

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The correct answer is option A

Plants performs both the functions photosynthesis and cellular respiration.The waste product of photosynthesis is oxygen that the plant releases in the environment.

Plants also performs cellular respiration and in the process of cellular respiration the waste product is carbon dioxide.

Hence, the waste products are carbon dioxide and oxygen.

The correct answer is carbon dioxide and oxygen

Which of the following takes place inside both mitochondria and chloroplasts? A. The flow of hydrogen ions is used to make ATP. B. The Calvin cycle builds sugar molecules. C. The Krebs cycle breaks down carbon based molecules. D. Light energy from the sun is captured and used to make ATP.

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The process that takes place inside both the mitochondria and chloroplasts, is A. The flow of hydrogen jobs is used to make ATP.

Heterotrophs take in mass in the form of food. Food is either used to build molecules within the body or as fuel for cellular respiration. If used for cellular respiration, this mass will eventually be converted into carbon dioxide, __________, and ____________.

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Water and ATP. This occurs because oxygen acts as the final electron acceptor in the Electron Transport Chain in oxidative phosphorylation, and ATP is produced via chemiosmosis when the H+ ions go down their concentration gradient to spin the turbines of ATP Synthase