The oldest true fossils are trace fossils called Stromatolites found in Australia, and dated between 3.5 to 3.3 billion years old.
Raphael Baumgartner and their team have finally uncovered evidence of organic matter in the ancient rock formations known as stromatolites found at the Dresser Formation fossil site in the Pilbara region of Western Australia. They detail their findings in a new article published in the journal Geology.
With a variety of methods, including scanning electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray spectroscopy, Raman spectroscopy, nano-scale secondary ion mass spectrometry, and stable carbon isotope analysis, the researchers examined the samples in thin slices.
According to the team's analyses, pyrite, a mineral with many tiny pores, makes up the majority of the stromatolites. Additionally, the pyrite contains nitrogen-bearing organic material and strands and filaments of organic material that closely resemble the remains of microbial biofilm colonies.
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Answer:
a. It is the volume ejected per beat
d. Mathematically, stroke volume equals EDV-ESV.
Explanation:
Stroke volume refers to the volume of blood which is expelled out by the left ventricle of the heart to the body.
The stroke volume can be measured with the echocardiogram which measures the EVD or End-diastolic volume which represents the volume before the contraction of the ventricle and the ESV or End-systolic volume which represents the residual volume after the contraction.
The Stroke volume is calculated by the difference between the EDV and ESV. The stroke volume for a normal person is measured is 70 mL per sec.
Thus, the selected option is correct.
The advent of phenothiazines was seen as instrumental in reducing the population of mental hospitals.
Phenothiazines is a class of antipsychotics that functions to modify functions of different receptors namely:
(1) Dopaminergic receptors - general antipsychotic property
(2) Serotonergic receptors - anxiolytic and antidepressant property
(3) Histaminergic receptors - sedative property
Some examples from this drug class is Chlorpromazine and Propericiazine. The use of these antipsychotic agent will eventually reduce the number of admitted patients in mental hospitals.
Answer:
Independent variable - Player being good or bad , presence of audience
Dependent variable - Performance of player
Explanation:
Independent variables are the constant variable in an experiment whose effect is studied on the subject of the experiment. While dependent variables are those which are dependent upon the independent variable.
Here, performance of the player is independent variable which is dependent upon the presence of audience. Hence “presence of audience” is the independent variable. Also , the type of player is also an independent variable which shall effect the performance of an individual player