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
VikaD [51]
3 years ago
13

Which of the following happened during the Precambrian Era?

Biology
1 answer:
malfutka [58]3 years ago
8 0
<h2>Answer:</h2>

<u>D. All of the above </u>

<h2>Explanation:</h2>

Precambrian time incorporates Earth's history from birth up to 590 million years back. That is, the Precambrian traverses 90% of Earth's presence. Fossilized microscopic organisms and blue-green growth demonstrate that crude life existed in any event 3,500 million years prior, and potentially prior.

However, it took another 2,100 million years for eukaryotic cells (plant and creature cells) to show up. These single-celled animals (protozoa) commanded the seas. Multi-cell creatures (spineless creatures) didn't advance until exceptionally late in Precambrian time, around 700 million years prior or 2,800 million years after life initially started on Earth.  

You might be interested in
Adults with more than a 12-month history of migraines were assigned randomly in a double-blinded study to receive treatment with
lyudmila [28]

Answer:

Phase III

Explanation:

The given condition fall in the trial phase (Phase III) of cinical study which aims to:

- Determine drug's effectiveness (primary goal)

- Determine long-term drug safety

- Confirm findings

In Phase III, randomised, double-blind, placebo-controlled, parallel group study is majorly to evaluate the efficacy and safety of placebo in episodic migraine prevention in children (6 to < 12 years of age) and adolescents (12 to < 18 years of age).  

The trial consists of four phases: screening; double-blind therapy period for 24 weeks in which placebo or Erenumab is given to subject as dose 1, dose 2 or dose 3 (based on the participant's body weight) once a month via subcutaneous injection; optional dose level blinded extension phase (40 weeks) which involves subjects recieve dose1, 2 and 3 of placebo, and at last it follows a safety follow-up phase for 12 weeks (after 16 weeks  of the last dose of investigational drug).

Hence, the clinical phase is phase III.

5 0
3 years ago
What is the term used to describe the time required to clear 50% of a given quantity hormone from the blood
kykrilka [37]
50%x 4842 because of you in your account number and you are now in 48525
7 0
2 years ago
11)
NeX [460]

Answer:

B

This is because since it is has less mass, it will accelerate faster, making it travel farther and faster.

6 0
3 years ago
The hormone that signals your cells to remove sugar from the bloodstream is
PtichkaEL [24]
Insulin. Although it is made in the pancreas, insulin is the hormone.
3 0
3 years ago
Read 2 more answers
What are the organs...
Ulleksa [173]
Organ, in biology, a group of tissues in a living organism that have been adapted to perform a specific function. In higher animals, organs are grouped into organ systems; e.g., the esophagus, stomach, and liver are organs of the digestive system.
7 0
2 years ago
Read 2 more answers
Other questions:
  • The by-products of cellular respiration include?
    14·1 answer
  • The proposed cause of CJD and kuru in humans, mad cow disease, and scrapie in sheep is a change in a brain protein. Disease vict
    14·1 answer
  • . The separation of DNA strands moves outward from the origin via the action of ___________, which untwists the double helix and
    7·1 answer
  • The introduction of Asian carp to the United States is an example of which type of pathway for invasive species?
    6·1 answer
  • Which biome had the highest average temperature?
    10·1 answer
  • How does cytokinesis occur in plant cells
    7·1 answer
  • Substances in the ecosystem are recycled by the _________.​
    5·2 answers
  • PLEASE HELP ME I BEEN STRUGGLING
    8·2 answers
  • How do they all function together?__________________________________________
    14·1 answer
  • What is aerobic respiration
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!