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
dusya [7]
3 years ago
9

1. When did stromatolites appear on Earth? Archean Hadean Mesozoic Proterozoic

Biology
1 answer:
professor190 [17]3 years ago
7 0

Answer:

Proterozoic

Explanation:

Stromatolites appear on Earth in the end of Proterozoic era because Proterozoic extended from 2500 million years to 542 million years. The stromatolites were present on earth about 542 million years ago. The stromatolites present in large number on the sea shores around the world and are considered as the Earth's first visible life form which can be seen through naked eye. These stromatolites were the first known organisms in which photosynthesis occurs and produce free oxygen..

You might be interested in
What molecule in the equation is a hydrcarbon?
Gwar [14]
Alkanes are linear, or branching, compounds that are made of varying numbers of carbon atoms that are all saturated with hydrogen atoms. The formula for an alkane is CnH(2n+2). This means that the number of hydrogen atoms equals twice the number of carbon atoms, plus two. Methane is the simplest hydrocarbon possible.
7 0
3 years ago
Based on changes in human populations from ancient times to the present, what do you think might have happened to movement of hu
Nezavi [6.7K]

Answer:

All of them are right

Explanation:

7 0
3 years ago
1. What atoms have you learned about that are involved in biomolecules? 2. How is a monomer different from a polymer?
just olya [345]

Answer:

Most biomolecules are organic compounds, and just four elements—oxygen, carbon, hydrogen, and nitrogen—make up 96% of the human body's mass. But many other elements, such as the various biometals, are present in small amounts.                   Sometimes polymers are also known as macromolecules or large-sized molecules. Usually, polymers are organic (but not necessarily). A monomer is a molecule that is able to bond in long chains.

Explanation:

Understand?

8 0
3 years ago
What is the name for a mass of fish eggs
VashaNatasha [74]
Typically it'd be called spawning or in some cases it could be called "roe".

So either "spawn" or "roe".
6 0
3 years ago
Read 2 more answers
ribose sugar is used to make nucleic acid however, it is not formed directly in photosynthesis but is formed from glucose. How d
Ilia_Sergeevich [38]

Answer: Ribose is synthesized from glucose and other monosaccharide molecules in living cells by a process known as pentose phosphate pathway. The pentose phosphate pathway is a series of chemical reactions taking place in the cytosol of cells.

5 0
3 years ago
Other questions:
  • A cell has undergone DNA replication and the number of chromosomes has doubled.what will happen next?
    15·2 answers
  • DNA is not found in the nucleus of all eukaryotes cells
    8·1 answer
  • While conducting an investigation, you observe that exposing inner mitochondrial membranes to ultrasonic vibrations disrupts the
    12·1 answer
  • What carry blood through the organs
    10·1 answer
  • What particles are shared between the atoms in the molecule
    10·1 answer
  • Distinguish common name and scientific name​
    13·2 answers
  • Which of the following is an example of a point source of population?
    15·1 answer
  • Choose all that apply.
    12·1 answer
  • 3. Describe What are two functions of the fluids in semen?
    13·2 answers
  • Can someone please help me with the next 15-20 questions that I'm about to upload today? they're all due today and it's for phys
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!