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
gulaghasi [49]
3 years ago
13

How did land whales eventually became aquatic?

Biology
1 answer:
cluponka [151]3 years ago
8 0

Explanation:

To swim, they move their tails up and down, rather than back and forth as fishes do. This is because whales evolved from walking land mammals whose backbones did not naturally bend side to side, but up and down. ... Whales do the same thing as they swim, showing their ancient terrestrial heritage.

Cetaceans are fully aquatic marine mammals belonging to the order Artiodactyla, and branched off from other artiodactyls around 50 mya (million years ago). Cetaceans are thought to have evolved during the Eocene or earlier, sharing a closest common ancestor with hippopotamuses.

You might be interested in
Write two differences between the unicellular and multicellular organisms.
Volgvan

Answer:

1.a unicellular organism has only 1 cell while a multicellular organism has 1 or more cell

2.a unicellular organism is a prokaryotic cell or bacteria, while a multicellular organism is mainly a eukaryote

Explanation:

4 0
3 years ago
Read 2 more answers
Which activity would be an appropriate first step when designing an experiment ?
trasher [3.6K]
The first step in designing an experiment is the form a testable question. 
7 0
3 years ago
As heat and pressure increase, ductile deformation _____.
ValentinkaMS [17]
As heat and pressure increase, ductile deformation becomes more likely
7 0
3 years ago
Read 2 more answers
How do Carnivores move energy through a eco-system?
scZoUnD [109]

Answer:

Many carnivores get their energy and nutrients by eating herbivores, omnivores, and other carnivores.

6 0
2 years ago
Describe the earth’s geography and atmosphere during this time period. What major events happened to help shape the earth during
Luba_88 [7]

The geological history of Earth follows the major events in Earth's past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System.

Earth was initially molten due to extreme volcanism and frequent collisions with other bodies. Eventually, the outer layer of the planet cooled to form a solid crust when water began accumulating in the atmosphere. The Moon formed soon afterwards, possibly as a result of the impact of a planetoid with the Earth. Outgassing and volcanic activity produced the primordial atmosphere. Condensing water vapor, augmented by ice delivered from comets, produced the oceans.

As the surface continually reshaped itself over hundreds of millions of years, continents formed and broke apart. They migrated across the surface, occasionally combining to form a supercontinent. Roughly 750 million years ago, the earliest-known supercontinent Rodinia, began to break apart. The continents later recombined to form Pannotia, 600 to 540 million years ago, then finally Pangaea, which broke apart 200 million years ago.

The present pattern of ice ages began about 40 million years ago, then intensified at the end of the Pliocene. The polar regions have since undergone repeated cycles of glaciation and thaw, repeating every 40,000–100,000 years. The last glacial period of the current ice age ended about 10,000 years ago

7 0
3 years ago
Read 2 more answers
Other questions:
  • Describe the ADP molecule and its function within a cell.
    6·1 answer
  • Glucose has how many carbon adams
    14·2 answers
  • Examples of autotrophic bacteria are: (a) parasites (b) saprophytes (c) pathogenic
    13·1 answer
  • Put the following in order: feces, bolus, and chyme
    13·2 answers
  • Is this a Prokaryotic or Eukaryotic organism?
    7·1 answer
  • 13. Describe the structure of a bone.
    12·1 answer
  • In a chemical change the atoms in compounds are rearranged to make new and different compounds.
    9·1 answer
  • Describe how algal blooms form.
    13·1 answer
  • Conclude Assess what kinds of traits make invertebrate such a diverse group of animals.
    5·1 answer
  • How long does it take blood to circulate through the body
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!