Answer:
Anaphase. In anaphase, the chromosome number is halved.
Answer:
The answer is "dead leaf."
Explanation:
Although dead leaves are no longer alive, they were considered as once part of a living entity. Therefore, dead leaves are biotic factors. Wind, iron gates, and sunlight are not biotic components because they are the non-living parts of the environment that influence biotic factors. Hope this helps.
Answer:
The nervous system can cause the contraction of all three types of muscle tissue. For example, skeletal muscle contracts to move the skeleton, cardiac muscle is influenced as heart rate increases during exercise, and smooth muscle contracts as the digestive system moves food along the digestive tract.
Answer:
DNA is the genetic material of all the living organism except some viruses. The structure of DNA consists of nitrogenous base, pentose sugar and the phosphate group.
Tube 1 - The nucleotide are linked together by phosphodiester bond. As these bonds are broken, the structure of DNA contains the individual complementary nucleotide are linked together by hydrogen bonds.
Tube 2 - The bond between the sugar and the bases are broken. The DNA structure consists of the phosphate group chain only with any pairing with the base.
Tube 3 - The DNA nitrogenous bases are adenine, guanine, thymine and cytosine that are linked together by hydrogen bonds. The agents break the hydrogen bonds. Now, the DNA structure consists of the single strand only.
Answer:
B. Stabilizing selection.
Explanation:
In a population, natural selection can favor one of the many phenotypes present. Directional selection is the phenomena where one of the extreme phenotypes is favored. Disruptive selection is the phenomena where both the extreme phenotypes are favored over the average phenotype. In stabilizing selection, the extreme phenotypes are not preferred so that maximum organisms fall under the average category.
Here, low spine number cacti are being eaten by peccaries and high spine number cacti are being eaten by a parasite. Both of these extreme phenotypes are under attack which will favor the cacti with average number of spines to survive. Hence, this is an example of stabilizing selection.
