Answer:
(A) Sandactylus would not have had networks of blood vessels in the skin of its wings if these networks were of no use to Sandactylus.
Explanation:
The given passage compares presence of similar structures, the blood vessels, in the wings of bats and winged dinosaur Sandactylus to explain the unknown function of wings in the dinosaur species. Bats are flying mammals and use wings to fly. The blood vessels in their wings serve to spread out the heat that is produced by flapping of wings during flying.
The presence of blood vessels in wings of dinosaur Sandactylus suggests that they also used wings for flying. If Sandactylus species did not use the wings for flying, their wings should not have blood vessels as gliding movement does not require it.
B) hypothesis
C) energy
D) force
B) The genome is DNA based and double stranded.
C) The genome is RNA based and single stranded.
D) The genome is RNA based and double stranded.
Answer:
A) The genome is DNA based and single stranded.
Explanation:
The reason why it is DNA based is because DNA contains thymine base (T). It is not RNA based because RNA contains uracil base (U) instead of thymine and in the given question there is not uracil mentioned.
It is single stranded because according to Chargaff's rule a double stranded nucleic acid must have the ratio of purine bases to pyrimidine ratio as 1:1.
Adenine (A) & Guanine (G) are purine bases while Thymine (T) & Cytosine (C) are pyrimidine bases so according to Chargaff's rule AG/CT = ~ 1. It means [A+G] = [C+T]
Also, A makes interaction with T while C makes interaction G. It means,
[A] = [T]
[C] = [G]
By this we can easily infer that a double stranded DNA will have as much A as much it has T & same goes with C & G.
But, in the given question, A = 33% while Thymine = 28% which are not equal so this means that this molecule is single stranded.
Answer:by breaking down carbonic acid into carbon dioxide and water.
The carbon dioxide is expelled from the body
Explanation:the body is able to maintain a constant internal environment through hoemostatis.one of such control is the acid-base balance in the body.
It does this by regulating the amount of hydrogen ions in the blood.A low pH indicates an acidic condition and a high pH indicates an alkaline condition.
The human blood has a pH of 7.35---7.45.it is slightly alkaline and needs to keep this range constant.
The lungs and kidneys involved in regulating the body pH.
When there is excess hydrogen ion in the blood, bicarbonate ions combine with the hydrogen ions to form carbonic acid . this carbonic acid breaks down into water and CO2 .the co2 is expelled from lungs through gaseous exchange.
When the accumulation of acid in the blood is high,the pH drops below 7.35 and this is called respiratory acidosis.
When there is excess alkaline in the blood,the pH goes beyond 7.45 and this is called respiratory alkalosis.
Word Bank:
Initial observation, hypothesis, experiment, observation and analysis of data, Interpretation, final hypothesis supported.
1. The researchers sampled all the plots throughout the growing season. They measured growth rates, and they analyzed the chemical composition of living leaves.
2.The researchers inferred that something limits grass growth in some places. It could be any environmental factor- temperature, sunlight, water or nutrients. Based on their knowledge of salt marshes, they proposed an idea: Marsh grass growth is limited by available nitrogen.
3. Data analysis confirmed that marsh grasses in experimental plots with additional nitrogen grew taller and larger than the controls.
4. Researchers observed that marsh grass grows taller in some places than in others. This observation led to a question: Why do marsh grasses grow to different heights in different places?
5. The researchers selected similar plots of marsh grass. All plots had similar plant density, soil type, input of fresh water, and height above average tide level. The plots were divided into control and experimental groups.
6. The researchers complied all of the data. They compared the average growth rate in each plot and the average height of the plants.
1. Observation and Analysis of Data
2. Hypothesis
3. Final Hypothesis Supported
4. Initial Observation
5. Experiment
6. Interpretation
The box of information can be classified according to stages of scientific methodology as Observation and Analysis of Data, Hypothesis, Interpretation, Initial Observation, Experiment, and Final Hypothesis Support.
Here's how each part of the experiment corresponds to stages of the scientific methodology:
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