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
tester [92]
3 years ago
9

What are the two subdivisions of the Precambrian Era called?

Biology
2 answers:
Irina-Kira [14]3 years ago
6 0
Archean and Proterozonic which are both broken into early middle and late periods
erik [133]3 years ago
5 0

Answer:

Two major subdivisions of the Precambrian era are Archean and Proterozoic.

Explanation:

The whole period of earth before the formation of the oldest rocks is known as the Precambrian period. It comprises all geological time before 600 million years ago. The two major subdivisions of the Precambrian period are-

1. Archean - It is an older subdivision of the Precambrian period prior to 2500 million years ago. It can be divided into early, middle and late.

Most abundant fossils are found during this period. In this period microfossils of photosynthesizing bacteria known are found.

2. Proterozoic- It is the second major subdivision of the Precambrian period prior to 600 million years ago up to 2500 million years ago. Traces of the Edicara fauna, bacteria, and blue-green algae and first oxygen dependent life-form are found in the Proterozoic period.

You might be interested in
Carbohydrates are important in the body because they contribute to the body's ability to
Mademuasel [1]

Answer:

carbohydrates are important in the body because they contribute to the body's ability to produce ATP

7 0
3 years ago
Read 2 more answers
"Once the ecological integrity of the Earth is ensured and our basic needs are satisfied, how much is enough?" What is ecologica
frozen [14]

Answer:

Explanation: Despite the affluence, there is still inequity. Increasing and deliberate inequity at that, for it is a necessary feature of a growth economy and the driver of material self-advancement. Desirable though high standards of living may be, there are finite global limits.

5 0
2 years ago
Indicate whether each of the following descriptions is true of microtubules (MT), microfilaments (MF), intermediate filaments (I
qwelly [4]

Answer:

(a) Microfilaments

(b) Microtubules

(c) Microtubules

(d) Microfilaments

(e) Intermediate filaments

(f) Microfilaments, intermediate filaments, microtubules

(g) Microfilaments, microtubules

(h) Microfilaments, intermediate filaments, microtubules

(i) Microtubules, microfilaments

(j) Microtubules

Explanation:

Microtubules (MTs) are dimers of the protein tubulin (alpha- and beta-tubulin subunits) and they are major components of the cytoskeleton. MTs play diverse cellular roles including, mechanical support (cytoskeleton), transport, motility, chromosome segregation, etc. Microfilaments (MFs) are protein filaments that also form part of the cytoskeleton in eukaryotic cells. MFs consist of G-actin monomers assembled in linear actin polymers, and their functions include mechanical support, cytokinesis, changes in cell shape, amoeboid movement, endocytosis and exocytosis, etc. MFs associate with the protein myosin to generate muscle contractions. Actin filaments/MTs assembly from monomeric actin/tubulin is caused due to energy expenditure, where ATP/GTP bound to actin/tubulin is hydrolyzed during polymerization. Finally, intermediate filaments (IFs) are a type of cytoskeletal element composed of a heterogeneous group of structural elements, and they are not found in all eukaryotes. The primary function of the IFs is to contribute to the mechanical support for the plasma membrane where these filaments come into contact with other cells and/or with the extracellular matrix. The IFs are not directly involved in cell movement. All 3 types of cytoskeletal elements (microfilaments, intermediate filaments, microtubules) can be visualized by fluorescence microscopy when cells express chimeric MT/IF/MF.–GFP fusion proteins.

8 0
3 years ago
Why mesophyll cell is considered as parenchyma cell​
VladimirAG [237]

Answer:

Mesophyll is not a tissue technically speaking. It's just a place, a specific area. Or you can even think of it as the set of all tissues in a given area.

6 0
2 years ago
Someone help me please
lukranit [14]
Weather is short period climate is over a period of years
4 0
3 years ago
Other questions:
  • 46) all cell cycle checkpoints are similar in which way?; a) they respond to the same cyclins.; b) they utilize the same cdks.;
    10·1 answer
  • Target organs regulate the pituitary through feedback loops. Most often, this takes the form of
    9·1 answer
  • Which of these is an environmental effect of farming pesticides?
    5·2 answers
  • Organisms that can interbreed and bear fertile offspring are considered to be in the same
    13·2 answers
  • This species of bacteria accounts for 12%-15% of all infant meningitis cases. It can grow at low temperatures, making the storag
    8·1 answer
  • What is the rough ER
    15·1 answer
  • Gel electrophoresis sorts DNA strands by length because longer DNA strands travel through the gel slower than shorter strands. W
    14·1 answer
  • 6. A relationship between 2 species, 1 species benefits and the host is harmed.
    14·2 answers
  • Which is a component of the biosphere?
    13·2 answers
  • Mrs. Underwood explained to her class her theory that people do not understand the importance of timelines until they have lived
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!