A is spring n summer to coincide with growing season
Answer:
Herbaceous or Woody stems.
Explanation:
Citrus belongs to Rutaceae family it is a genus of shrubs and flowering trees (feature of angiosperm plants) Plants which belongs to this genus produce citrus fruits like grapefruits, lemons, oranges, limes etc.
These plants are large shrubs, and 5-15 m tall trees with woody stems, alternatively arranged leaves with an entire margin and spiny shoots. Flowers are small in size each are 2-4 cm in diameter with numerous stamens and five petals, rarely four petals are present. Their leaves and flowers are very strong in scent.
Answer:
Because T-cell-independent antigens do not activate helper T cells, they fail to induce B cell memory, affinity maturation, or class switching, all of which require help from T cells. They therefore mainly stimulate the production of low-affinity (but high-avidity) IgM antibodies.
Explanation:
Answer;
Gene flow
Gene flow is the most important factor that holds a gene pool of a species together and prevents speciation.
Explanation;
-Evolution may occur as a result of genes being transferred from one population to another. This gene flow occurs when there is migration. The loss or addition of people can easily change gene pool frequencies even if there are no other evolutionary mechanisms operating.
-Gene flow may also occur without migration, for instance, when people travel to another area and successfully mate with people in the population there, a transfer of genes occurs between the populations even though the traveler returns home.
-Additionally, gene flow may flow between species. A good example is when segments of DNA are transferred from one species to another by viruses as they invade the cells of animals or plants.
