The phanerozoic geologic era is divided into three and the paleozoic era is the first among them. The paleozoic era occurred about 902 million years ago and it divided into six different periods. It was a time of dramatic changes in term of climate, geology and evolution.
During the first period of the paleozoic era large number of creatures evolved, this is called Cambrian explosion. Most of the biological classes that are still prevalent today such as primitive fish and coral were evolved during this era. Mass evolution of fish also occured during this era. <span />
Answer:
The correct option is C and D.
Explanation:
There are certain plants which require certain temperature ranges to grow such as the Joshua trees. As these plants are not able to grow in warm conditions, hence it is better that these trees be grown in the north where the climate is cooler and best suitable for these Joshua trees. Hence, the correct option is C.
Also, if we want the trees to grow, we can limit their growth to only winters.
Answer: The cell membrane is a lipid bilayer that prevents that passage of water and ions. This allows cells to maintain a higher concentration of sodium ions out the outside of the cell.
Using a Punnett Square you can solve this. If two heterozygous individuals with polka-dot tails mate then both their genotype would be Pp. The Punnett square will then look like this:
P p
P PP Pp
p Pp pp
Now if you look at the square, you have the following genotype and phenotype combinations:
PP = 1 out of 4 = 25% : Homozygous polka-dot.
Pp = 2 out of 4 = 50%: Heterozygous polka-dot
pp = 1 out of 4 = 25% Homozygous solid color
With that the answer would then be A. <span>75 percent chance of a polka-dot tail and 25 percent chance of a solid colored tail (25 percent PP; 50 percent Pp; 25 percent pp).</span>