Scientists today can use many investigative methods to study evolution. Which method was developed after Darwin'stime?
O DNA comparisons
o observations
O comparison of fossils
O experimentation


Answer 1


DNA comparisons


The molecular nature of DNA and its role in inheritance and evolution was not known during Darwin's time.  Therefore, it was not possible to compare similarities in DNA sequences between different species to understand their evolutionary relationships.  

This type of method was not in regular use until the 1980s/1990s, when sequencing and DNA amplification technologies were invented

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A)What effect does high temperature have on radish germination independent variable



This question is asking to identify the independent variable in the scientific question.

The independent variable is TEMPERATURE


Independent variable in an experiment refers to the variable that is subject to change or manipulation by the experimenter in order to bring about an effect or response in the dependent variable.

In this scientific question that states: What effect does high temperature have on radish germination?, the independent variable is the TEMPERATURE because it is what is being changed in the experiment in order to effect a response in the germination of radish (dependent variable).




It does not change


I think it is correct


Someone please help ASAPPPP


I believe the answer is A


(its C)

if its right tell me!

Mycoplasma A. lack peptidoglycan.B. are the smallest free-living organisms.C. have sterols in their membranes.D. are killed by penicillin.E. lack peptidoglycan, are the smallest free-living organisms AND have sterols in their membranes.



E. lack peptidoglycan, are the smallest free-living organisms AND have sterols in their membranes.


Mycoplasmas are also called pleuropneumonia-like organisms (PPLO) are the smallest free-living, prokaryotic organisms. They do not have a cell wall and is bounded by a plasma membrane which contains sterol.

Since cell wall is absent in them, they lack peptidoglycan. These are present in animals, plants, insects, soil and sewage. They grow better in the aerobic environment but can also live as facultative anaerobes.  

Mycoplasma cause infection, affects cell metabolism, gene expression.

Urban areas use __________ energy __________ than rural areas, mostly because so many more people live there. A) solar power B) more; in total C) less; in total D) an electric furnace


The correct answer is - B) more; in total.

The urban areas use much more energy than the rural areas, by far. The reasons for that are numerous, with the two biggest being the number of people and the industry.

The number of people living in urban areas is higher than the number of people living in rural areas. Also, the people in the urban areas use much more energy because they rely on much more technology, technology that uses energy in order to work.

Most of the industry is also located in and around the urban places. The industry is a huge consumer of energy, thus increasing the usage of energy further more.

The freshwater and salt water biomes are divided into different levels or zones. What are these levels or zones, and if stated, what kinds of organisms live in the different levels or zones? (Site 1)


Freshwater means low salt content. The zones namely Standing which is compose of ponds and lakes and has littoral zone which algae,floating aquatic plants and clams can be found. Next is limnetic zone and has plankton. Next is Flowing includes streams and rivers and in there resides catfish and carp. For sea water it has Marine which has aphotic zone where anemones,arrow worm and angler fish resides.Another, coastal zone compose of coral reefs and mangrove and lastly the intertidal zone with small critters.

A freshwater and salt-water biome refers to the body of water (aquatic biome) that makes up about 75 percent of the surface of planet Earth.

The freshwater biome is divided into three (3) major levels or zones and these include:

1. Littoral zone: it is the shore area of a freshwater and it can either be very wide or very narrow.

Some examples of organisms found in the littoral zone are:

  • Cattails.
  • Pond fish.
  • Frogs.
  • Turtles.
  • Water snakes.

2. Limnetic zone: it is the open water area of a freshwater.

Some examples of organisms found in the limnetic zone are:

  • Planktonic algae.
  • Fish.
  • Zooplankton.
  • Insects.

3. Profundal zone: it is the bottom and deep water area of a freshwater.

Some examples of organisms found in the profundal zone are:

  • Fungi.
  • Bacteria.
  • Blood worms.

On the other hand, a salt-water biome is divided into four (4) major levels or zones and these include:

1. Intertidal zone: it comprises these organisms;

  • Sponges, anemones, barnacles, whelks, green algae, isopods, chitons, crabs, snails, etc.

2. Pelagic zone: it comprises these organisms;

  • Dolphins, plankton, jellyfish, floating seaweed, tuna, and sharks.

3. Abyssal zone: it comprises these organisms;

  • Bivalves, fishes, snails, deep sea jellyfish, crustaceans, anglerfish, deep sea shrimp, cephalopods, shark, etc.

4. Benthic zone: it comprises these organisms;

  • Crustaceans, lobsters, mussels, sea stars, macroalgae, sponges, sea urchins, polychaete worms, seagrasses, echinoderms, etc.

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