Answer:
the type of molecule-destroying enzyme he used
Explanation:
Frederick Griffith and Oswald Avery were scientific researchers who discovered DNA. Frederick Griffith began the research and Oswald Avery continued his research in 1944 when they made the discovery of DNA. When Avery repeated Griffith's research the experimental variable in Avery's experiment was the type of molecule-destroying enzyme he used.
A.
fossil records <--- thats what i think
B.
radiometric dating
C.
extinction
D.
geologic time scale
Answer: B. radiometric dating
Radiometric dating is an aging process which is used to age rocks and other objects associated with them. This is based upon the decay process of radioactive isotopes present in the rocks. The radioactive decay is the process in which an unstable nucleus loses it's energy in the form of emerging radiation. The age of the typical rock is determined by the half life of the decayed products.
Answer:
Carbohydrates.
Explanation:
Carbohydrates are essential to the body. They are sugars or starches that provide energy for all the cells and tissues in the body. There are two different types of carbohydrates: simple and complex.
Answer:
The correct answer is option B, lower than the threshold velocity for sand
Explanation:
Threshold velocity of the soil is the velocity where soil has overcome the gravitational force and the inter particle force and it starts moving. The factors which affect the threshold velocity of soil are –
a) Lower the sand content , higher will be the threshold velocity
b) Size of aggregates in the soil – the larger the size of the aggregate the larger will be its velocity
c) Size of soil particles – soils with soil particle size greater than 1 mm shall move easily.
Considering all the above three factors, it is clear that the threshold velocity of silt is lower than that of sand as the sand content in silt is high and also its particles are finer than that of sand particles.