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
Diano4ka-milaya [45]
3 years ago
8

Which compound was abundant in Precambrian Earth’s oceans, before complex life evolved on Earth?

Biology
2 answers:
Ganezh [65]3 years ago
7 0
The Precambrian time refers to the time 4.5 billion to 542 millions year ago. This period is characterized by having reduced atmosphere and included reduced compounds. Scientists believed that atmosphere at that time was devoid of free oxygen and CO2 was present in excess. Before the complex life evolved on the Earth, the Precambrian Earth's ocean contained dissolved carbon dioxide.
Ksivusya [100]3 years ago
6 0

dissolved carbon dioxide

You might be interested in
From 2010 to 2011 the percentage of electricity generated from burning coal fell, while the percentage of renewable energy sourc
Natali [406]
<span>C) Less carbon dioxide would be released into the atmosphere.

</span>
6 0
3 years ago
I observe that squirrels that live in the southeastern United States are much thinner than squirrels that live in the northeaste
stiv31 [10]

Answer:

No, it is not a scientific theory.

Explanation:

  • A scientific theory is a proposition that is made to explain the various phenomena that are occurring in nature and it is supported by experiments that have repeatability and well-analyzed results.
  • Scientific theories are usually tested in experiments under controlled conditions and verified as well.
  • In the given situation, the theory made by the observer is not being tested through any experimentation or quantification and therefore, it is just a hypothesis and not a scientific theory.

6 0
3 years ago
Which kingdom contains organisms that are multicellular,heterotrophic, eukaryotic and lack cell walls
Anastaziya [24]
<span>Animalia -</span><span>  Mammals, amphibians, reptiles, birds, fish, mollusks, and insects are all included in this kingdom.</span>
4 0
3 years ago
Read 2 more answers
An advantage of a complete digestive system over a gastrovascular cavity is that the complete system _____.A) excludes the need
babunello [35]

Answer:

B. Allows for specialized regions with specialized functions

Explanation:

Where the complete digestive system has different specialized regions to perform specialized functions, the gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms).

6 0
3 years ago
Soil in which of the following habitats is the least dense?
julia-pushkina [17]
I wanna say A. Desert

Hope this helps!!
5 0
3 years ago
Other questions:
  • This type of blood vessel is responsible for maintaining blood pressure during diastole, therefore it has the thickest layer of
    7·1 answer
  • TRUE/FALSE
    15·1 answer
  • What can I do to not fall asleep in class?
    12·1 answer
  • Bacteria and bacteriophages are undergoing an evolutionary battle. In particular, phages that infect Salmonella enterica can use
    11·1 answer
  • An attempt to explain observations of the natural world is
    10·1 answer
  • What do you do if you have blood on chicken wings?
    14·2 answers
  • Coelacanths and lungfish are collectively known as the lobe-finned fishes, and have fins containing similar arrangements of bone
    7·1 answer
  • Explain how to focus a microscope using the high power lens. Include any safety issues you need to be aware of.
    5·2 answers
  • HELPPPPPPPP FASTTTTTTTTTTT NOWWWWW
    8·1 answer
  • Between the nucleus and the electrons is empty space ?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!