Answer:
Estrogen is a steroid hormone which is required for the maintenance of female characteristics of the female body released by the follicle and corpus luteum of ovary.
They act in females through hormone cascade or sequential action of hormones which are controlled by feedback cycles either in a positive cycle or negative ways.
This hormone is associated with the follicular phase of menstruation as:
1. Negative feedback mechanism- estrogen influence pituitary gland to decrease the production of follicle stimulating hormone (FSH) which stimulate the ovary to produce estradiol.
2. Positive feedback mechanism- occurs near the end of the follicular phase estrogen which causes the anterior pituitary gland to release more FSH.
Thus, estrogen act by both positive and negative feedback mechanism.
a composite volcano
b lava plateau
c cinder cone
d caldera
a. fatty acid
b. amino acid
c. nucleotide
d. monosaccharide
b. lake
c. salt marsh
d. upstream part of a river
(PLEASE HELP)
Explanation:
The gradient of slope – the steeper the gradient the higher the velocity
the shape of river channel – the more straight the channel (with fewer meanders) the higher the velocity
The volume of water that the river carries – The more water the higher the velocity because more water has more mass that carries more momentum.
The roughness of the substrate or stream bottom – The rougher the river bed is, the slower the river water velocity due to increased turbulence and less laminar flow
The depth & width of the stream – The narrower and deeper the river channel the higher the velocity. This is because the water has a lesser surface area to rub against the river bed as it flows hence gains higher speeds due to lower friction.
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In some lizard species, a short tail is recessive and a long tail is dominant. According to the principle of dominance:
a lizard with a TT genotype will have a short tail
a lizard with a tt genotype will have a long tail
a lizard with a Tt genotype will have a short tail
a lizard with a tt genotype will have a short tail
Answer:
water and air is the other 50%
Explanation:
The particles that make up soil are categorized into three groups by size: sand, silt, and clay. Sand particles are the largest and clay particles the smallest. Although a soil could be all sand, all clay, or all silt, that's rare. Instead most soils are a combination of the three.
The relative percentages of sand, silt, and clay are what give soil its texture. A loamy texture soil, for example, has nearly equal parts of sand, silt, and clay.
SOIL HAS STRUCTURE
Soil structure is the arrangement of soil particles into small clumps, called "peds". Much like the ingredients in cake batter bind together to form a cake, soil particles (sand, silt, clay, and organic matter) bind together to form peds. Peds have various shapes depending on their “ingredients” and the conditions under which the peds formed: getting wet and drying out, freezing and thawing--even people walking on or farming the soil affects the shapes of peds.
Ped shapes roughly resemble balls, blocks, columns, and plates. Between the peds are spaces, or pores, in which air, water, and organisms move. The sizes of the pores and their shapes vary from soil structure to soil structure.