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
photoshop1234 [79]
4 years ago
10

Tickleback evolution lab final quiz 1. how did some ancestral sea-run stickleback populations come to live exclusively in fresh

water? these populations swam to freshwater lakes to spawn and then never returned to the ocean because there were fewer predators in lakes. they became trapped in lakes that formed at the end of the last ice age. they don't actually live exclusively in fresh water; they only live in fresh water at certain stages in their lives. they developed traits that made them better adapted to fresh water and, as a result, had to move to a freshwater environment to survive.
Biology
1 answer:
Anastasy [175]4 years ago
3 0

Answer:

The correct answer is "some stickleback populations come to live exclusively in fresh water they became trapped in lakes that formed at the end of the last ice age".

Explanation:

There are different types of speciation. Allopatric speciation consists of the geographic separation of a continuous genetic background so that it can give place to two or more new geographically isolated populations. Some barriers might impede the genetic interchange or genetic flux, making a place to two new populations that are separated and can not get together to mate anymore. Glaciation is one of the most important drivers of speciation and production of different phylogeographic structures by vicariance. Glacials originate isolated gene-pools that accumulate differences that end in reproductive isolation. Melting of the ice also generated divergence and speciation, as land appearance acted as a barrier for some populations.  

During the last glaciation, stickleback fishes were able to reach certain new places or areas that provided better conditions to inhabit. There were fewer predators and more available food sources that made these new areas to be a better choice. These new grounds were lakes and were the product of ice melting. But at a certain point, as ice melting increased, the land started to show up again and became a barrier for this species. Animals that were living in lakes could not go back to the sea, they were trapped so they had to adapt to living exclusively in lakes. This species diverged and suffered speciation.

You might be interested in
What would happen in an ecosystem without decomposers?
tiny-mole [99]

The right answer is: Plant growth would decrease.

Decomposers are living beings directly involved in the decomposition of dead organic matter (necromass) or excrement or excreta of living beings. They play a major role, necessary for the recycling of the elements (minerals, trace elements ...) that make up the organic matter, in an inorganic matter which will subsequently be absorbed by the plants (which explains the decrease of the growth of the plants during the absence of decomposers).

8 0
4 years ago
Read 2 more answers
Select the correct answer.
djyliett [7]

Answer:

D.  

oldest rock with reversed polarity

Explanation:

I took the End of Semester Test on Edmentum.

8 0
3 years ago
Which of the following are grouped together to form chromosomes?
Keith_Richards [23]

Answer: D) ALL THE ABOVE

HAVE A BLESSED DAY!!!!! :)

5 0
3 years ago
The structure that allows for the formation of an electrochemical gradient is the ____________. Select one: a. Ribosome b. Thyla
lions [1.4K]
Gradient is the d. dinner membrane of chloroplast
7 0
4 years ago
1. The movements of energy and nutrients through living systems are different because (1 point)
mariarad [96]

1. Answer;

A. energy flows in one direction and nutrients recycle.

Explanation;

-The movements of energy and nutrients through living systems are different because the energy flows in one direction and nutrients recycle.

-Energy is transferred between organisms in one direction in a food chain, but that interconnected food chains make a food web.

-Most ecosystems get their energy from the Sun. Producers can use sunlight to make usable energy by converting it into chemical energy or food. Consumers get some of that energy when they eat producers, they pass some of the energy to other consumers when they are fed on.

2. Answer;

Nitrogen fixation.

Nitrogen fixation depends on bacteria.

Explanation;

Nitrogen fixation is the process by which nitrogen is taken from its stable gas form (N2) in air and then converted into other nitrogen compounds (such as ammonia, nitrate and nitrogen dioxide) useful for other chemical processes.

-The nitrogen fixing bacteria are microorganism capable of converting atmospheric nitrogen into forms usable by plants. They include the free-living bacteria, which includes cyanobacteria, azotobacter etc. and others such as mutualistic bacteria such as Rhizobium.

3 0
4 years ago
Read 2 more answers
Other questions:
  • Liquids that do not mix form into layers when they have __________ densities.
    9·2 answers
  • What 3 currents are formed in the beach?
    15·1 answer
  • What is the measurement of a population per unit area?
    14·1 answer
  • This element is solid, forms the backbone of many compounds, and life is based on it. What is it?
    14·2 answers
  • PLEASE HELP!! WILL GIVE BRAINLIEST!!! I need help please!!!!
    9·1 answer
  • How is liver malfunction likely to affect digestion?
    12·1 answer
  • In the United States , the majority of businesses are privately owned and the government control of business is limited. This id
    6·1 answer
  • What are the advantages of classification?
    8·1 answer
  • What are the catalysts that speed up chemical reactions in the human body called?
    5·1 answer
  • What three elements are present in all carbohydrates?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!