Yes and to make sure just check the comments
The answer is A.
Twins form in one of two ways:
Identical twins occur when a single fertilized egg splits into two.
Fraternal twins occur when two, separate eggs are fertilized by two, separate sperm.
Arwin in 1856 proved that all pigeon breeds do originate from the Rock Dove and through a process of regression you can recreate the Rock Dove, the ancestor of all pigeon breeds. Hopefully that helped
Answer:
In this case, here are the options to complete the question
A. Porosity is a measure of the amount of the substance composed of empty spaces.
B. Permeability is the same thing as secondary porosity.
C. Permeability is a measure of how well the pores are connected.
D. Porosity describes the ability of pores to form conduits through the material
The ANSWER IS SURELY
A. Porosity is a measure of the amount of the substance composed of empty spaces.
C. Permeability is a measure of how well the pores are connected.
Explanation:
Porosity is used to estimate the amount of a rock that is open space between grains or within cracks or rock cavities.
Permeability is the ease of which water moves through a porous rock.
Answer:
may be D is the right answer because
electrons microscope it not easy to handle and so expensive but light microscope is easy to handle and less experience
