Certain seed-eating birds are able to crack seeds according to the size of their beaks. Long beaks are able to crack larger seeds, whereas shorter beaks are able to crack smaller seeds. A graph of a bird population with different-sized beaks is shown below.After a several-year drought, smaller seeds became scarce, but drought-resistant trees continued producing larger seeds. What graph would best predict the change in beak length of the bird population?
Answers
The graph that would best predicts the change in the break length of the bird population is that of the third graph.
How are the beaks of the seed-eating birds developed?
The seed-eating birds includes the Sparrows and finches, and redpolls. Grouse has different sizes of beaks as per the body ratio. Evolution and natural selection play a crucial role in the development of the beaks. The shape of the break determines the type and shape of seed it will eat.
As per the graph given the length of beaks will increase as the number of individual birds increases. Thus the diversity of breaks depends on the diversity of the species. Hence the option C is correct.
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Answer:
its the last one
Explanation:
because it was good then bad after drought
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Which of the following statements about tRNA is FALSE? A. tRNAs of both eukaryotes and prokaryotes share common features. B. The two-dimensional structure of tRNAs exhibits a cloverleaf pattern. C. tRNAs are produced in the nucleus. D. functional tRNAs have been spliced by splicesomes. E. tRNAs possess an anticodon complementary to the codon.
What are examples of positive and negative control of the lac operon? Answer 1. Lactase, which breaks down lactose, is an example of positive control, and cAMP, which binds to CRP, is an example of negative control. 2. cAMP, which binds to CRP, is an example of positive control, and lactase, which breaks down lactose, is an example of negative control. 3. Lactase, which breaks down lactose, is an example of positive control, and glucose, which reduces cAMP, is an example of negative control. 4. Glucose, which reduces cAMP, is an example of positive control, and lactase, which breaks down lactose, is an example of negative control.
RNA has the nitrogenous base of uracil instead ofwhich is present in DNA.A. adenineB. cytosineC. thymineD. guanine
Answers
Final answer:
Over many years, the lynx populations separated by a river will likely experience phenotypic changes, with the northern population developing thicker coats due to colder weather. This change is a result of selective pressures and can lead to geographic variation known as a cline, possibly culminating in speciation.
Explanation:
The question asks about how two lynx populations, separated by a river, will differ in their coat thickness after many years due to different environmental conditions. The population on the north side of the river experiences much colder weather compared to the population on the south side. Over time, due to geographical variation and selective pressures from their respective environments, it is likely that the two lynx populations will exhibit phenotypic changes, such as variations in coat thickness.
These changes can be understood as a type of geographic variation known as a cline, where a species' characteristics gradually change across an ecological gradient. In this case, we would expect the population in the colder northern environment to develop thicker coats as an adaptation for better heat conservation, a trait that would be less advantageous for the population on the warmer southern side of the river. This adaptation is a result of the selective pressures imposed by the differing climates on either side of the river.
Over many years, the accumulation of these selective pressures can eventually lead to significant divergence between the two populations, potentially giving rise to speciation if the genetic differences become substantial enough to prevent interbreeding should the river barrier be removed.
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Answer: The northern Lynxes' will experience thicker coats over time, the southern Lynxes will experience no chance whatsoever.
Explanation: the northern lynxes live on the colder side so they will adapt to be more used to the environment. the southern lynxes will stay the same because the weather isn't that bad.
wait to see if it goes lower
increase muscle activity to generate heat
add fur or fat to increase insulation
Answers
Answer: The correct answer would be increase muscle activity to generate heat.
Explanation:
Endothermic animals are those which maintain their body temperature mainly by their metabolic activity irrespective of environmental heat.
In case, there is a drop in environmental temperature then endothermic animals increase their metabolic activity and metabolize sugars and fats at a faster rate.
It release more heat and increase the body temperature.
One the various methods for increasing metabolism is increase in muscle activity such as done in shivering. Shivering increases muscle activities which increases body temperature.
Final answer:
An endothermic animal would increase muscular activity to generate heat in response to a sudden drop in environmental temperature. This internal heat production is part of their physiological adaptation to maintain stable body temperature in varying conditions.
Explanation:
When faced with a sudden drop in environmental temperature, an endothermic animal will typically increase muscle activity to generate heat. Unlike ectothermic animals, endotherms maintain a stable internal body temperature despite changes in the environment. They are capable of doing this because they generate their own heat internally, often through processes like muscular activity including shivering. Therefore, in an attempt to sustain a constant body temperature when exposed to a colder environment, muscular activity within the animal would increase to produce more heat. This, in turn, helps to counteract the cooling effect of the lower external temperatures.
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b. myofilament
c. sarcolemma
d. endomysium
Answers
Answer:
Sarcomere
Explanation:
Myofibril is the unit of the muscle cell. The myofibril is rod like in structure and developed by the process of myogenesis in embryo.
Sarcomere is the basic structural unit of the skeletal muscles and shows striations under the microscope. Sarcomere consists of thick and thin filaments of actin and myosin. Different bands like A- band , H-Band, I-Band and Z- line is visible in the sarcomere.
Thus, the correct answer is option (A).
B. start a chemical reaction
C. produce a catalyst
D. produce the reactants
Answers
Answer:
Option B is correct.
B. start a chemical reaction
Explanation:
Activation energy is the amount of energy that is needed to start a chemical reaction. To start a chemical reaction we have to provide this amount of energy. Different type of catalyst are used to lower the activation energy and catalyze the reaction.
Final answer:
Activation energy refers to the energy needed to initiate a chemical reaction, making 'B. start a chemical reaction', the correct answer to the question.
Explanation:
Activation energy is the amount of energy required to start a chemical reaction. It's the necessary energy to break the initial bonds of the reactants in a chemical reaction. Without adequate energy to pass this threshold, the reaction cannot proceed. For example, the energy required to start a fire (the reaction) is the heat from a match or lighter (activation energy). Once this energy threshold is surpassed, the reaction continues until the reactants are used up or another factor stops it. Hence, the correct answer to your question is B: start a chemical reaction.
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-this is science-
Answers
water canexistinthreestates;liquid,solidandgases.
Explanation:
At temperature below zero degree Celsius, water exists as a solid but as it absorbs temperature from Its surroundings, it undergoes melting and turns into liquid water. More application of heat makes it boil leading to the evaporation and vapourisation of water molecules( note: evaporation occurs at all temperature).
Answer:
give them brainlist
Explanation:
Answers
Answer:
Hope this will help you... And please mark me as Brilliant
Explanation:
Permineralization. Permineralization is a process of fossilization that occurs when an organism is buried. The empty spaces within an organism (spaces filled with liquid or gas during life) become filled with mineral-rich groundwater. ... Small-scale permineralization can produce very detailed fossils.