1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
n200080 [17]
3 years ago
13

A scientist is studying the fossil record to construct an evolutionary lineage for an order of fishes. The scientist proposes th

at the lineage involves long periods of little change to species and then brief periods of significant changes. Is the scientist’s proposal consistent with modern evolutionary theory?
A) Yes, the scientist is describing a pattern of punctuated equilibrium
B) Yes, but only if the brief periods of significant changes occurred after mass extinctions.
C) No, species evolve only gradually and at a relatively constant rate of change.
D) No, species evolve only gradually, although the rate of change may vary among evolutionary lineages.
Biology
1 answer:
Sedaia [141]3 years ago
6 0

Correct Answer: A. Punctuated equilibrium is an evolutionary theory that suggests that species remain stable/somewhat unchanging throughout most of their existence and go through rapid changes in relatively short periods. This rapid change in the species' traits is typically attributed to geologic events (ex: mountain range forming and separating 2 populations of the same species, which would lead to different selective pressures on either side of the mountain and changes in the traits of the two populations).

Incorrect Answers:

B. Mass extinctions might be a good explanation for significant changes in a species in a brief period of time (if the species was one of the species to survive the extinction), but this is definitely not the ONLY explanation for such changes in a population.

C. There are theories that suggest a gradual and relatively constant change in species throughout their existence, but there is more evidence (especially in the fossil record) and support for punctuated equilibrium.

D. ***same explanation as C***

You might be interested in
Which would not be found in pancreatic juice secreted into the duodenum?
AURORKA [14]

Answer:

The answer is insulin.

Explanation:

Pancreatic juice is an enzyme containing secretion produced by the pancreas into the small intestine. Enzymes in the pancreas help in digesting proteins, carbohydrates and fats. The constituent enzymes are as follows:

  1. Trypsinogen and Chymotrypsinogen: Precursors of the proteases, trypsin and chymotrypsin that digest proteins. They are released as precursors to protect the intestinal lining. Enterokinase, an enzyme secreted by small intestine's epithelial cells, activates these precursor.
  2. Lipase: Enzyme that digests lipids by hydrolysing triglycerides into 2-monoglyceride and two free fatty acids.
  3. Amylase that helps in digesting any left over carbohydrates and complex starch.

Insulin:

Insulin can never be part of pancreatic juice because it is a hormone, not an enzyme. Hormones are chemical messengers secreted only in blood. Insulin is a hormone secreted by the pancreas to lower blood glucose levels by binding to insulin receptors on cells and stimulating the intake of glucose through glucose transport channels (GLUTs) in the cell membrane.

4 0
4 years ago
Which statement best describes the age of the seafloor?
Fittoniya [83]
The correct option is B. The newest crust on earth is located at the actual site of the floor spreading and as new crusts are formed they replace it. Thus, the older the crust the farther it is from the mid ocean ridge. 
Sea floor spreading is a geological process in which tectonic plates splits apart from one another. It occurs at divergent plate boundaries.
3 0
3 years ago
14. Operons allow prokaryotes to
Vladimir79 [104]
14: Operons allow prokaryotes to replicate DNA at the appropriate time.

Operons are specific regions of genes that are linked to a singular process. They ensure that the expression of these genes does not go unchecked and only occurs when necessary. Two key examples of this in humans are the lac operon and trp operon. 

15. The central dogma of molecular biology is:

DNA to RNA to Proteins

Protein Synthesis occurs in 3 steps. 

First our DNA is translated into RNA. Next the RNA is sequenced into Amino Acids by reading the corresponding 3-Base Codons. These Amino Acid sequences form various protein structures. 
4 0
4 years ago
9. Because the sun heats sections of the Earth more or less, and hot
Nadya [2.5K]

Answer:

This shows the interaction between the earth and sun.

Explanation:

  • There is a variation in the amount of heat that reaches the different latitudes as the interaction between the sun and earth which firms different angles of incidence on the surface.  
  • The rays of the sun are more concentrated in mid latitudes that is the tropics and are slanting towards the poles this due the tilt in axis of earth.  
  • This variation lads the warm air to rise and reach the poles and similar the cold polar air reaches the tropics and develops a cycle of convective cells.  This leads to a latitudinal balance in temperatures.
3 0
3 years ago
Which factor is a major influence on climate?
olya-2409 [2.1K]

Answer:

A

Explanation:

A because water is a essential resource to humans and all types of life.

4 0
3 years ago
Other questions:
  • Which question can be answered using the scientific process?a. how long does it take a paper bag to break down?b. should people
    14·2 answers
  • Which best describes the geologic time scale?
    8·2 answers
  • What properties DO NOT require a tool?
    12·1 answer
  • Define Law of Conservation of Energy.
    5·1 answer
  • In which row are the parts of the neuron below correctly labeled?<br> A<br> B<br> C<br> D
    15·2 answers
  • Which phrase best summarizes the theory of evolution by natural selection?
    9·2 answers
  • Objects that are not moving have NO _____.
    8·1 answer
  • Can we please help
    7·2 answers
  • ____ are unicellular organisms with no nucleus that can cause diseases and pain with toxins.
    10·1 answer
  • ANSWER FOR BRAINLIEST
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!