The menstrual cycle is complex and controlled by many different glands and the hormones that these glands produce. The four phases of the menstrual cycle are menstruation, the follicular phase, ovulation and the luteal phase. Common menstrual problems include heavy or painful periods and premenstrual syndrome (PMS).
Primary sewage treatment is a physical process that removes large impurities while secondary sewage treatment is a biological process that removes organic matter of sewage through the action of microbes.
Standing state is amount of inorganic nutrients found in an ecosystem.It represents part of non-living matter.
Standing crop is certain mass of living material at a particular time. it is a measure of biomass of living organisms.
[refer class XlI biology NCERT chapter - Ecosystem ]
Aldosterone is the main mineralocorticoid steroid hormone produced by the zona glomerulosa of the adrenal cortex in the adrenal gland. It balances sodium and potassium levels in blood. So, option-C is the correct answer.
Habitat destruction is an important cause of known extinctions. As deforestation proceeds in tropical forests, this promises to become THE cause of mass extinctions caused by human activity.
All species have specific food and habitat needs. The more specific these needs and localized the habitat, the greater the vulnerability of species to loss of habitat to agricultural land, livestock, roads and cities. In the future, the only species that survive are likely to be those whose habitats are highly protected, or whose habitat corresponds to the degraded state associated with human activity (human commensals).
Eustachian tube also called auditory tube which is supported by elastic cartilage giving it shape , providing shape for the lateral region of the external auditory meatus and medial part of the auditory canal.