some of the special structures in the members of these phylum as follows:
Members of porifera are sponges. they have collar cells and cellular -level body organization. Cnidarian have stinging cells present on the tentacles around the mouth. Ctenophorans have comb-like plate cells for swimming. Platyhelminthes - members are first to have sensory and nervous tissue in the head region.
Thyroxine is an important hormone released into the bloodstream by the thyroid gland in the body. When tyroxine is released into the blood stream, it moves through certain organs such as the kidney and liver, where most of it is changed to an active form known as triiodothyronine. Thyroxine perform important roles in brain development, heart and digestive functions, bone maintenance, controlling muscle and metabolic rate of the body.
Answer:
A. Independent Assortment
Explanation:
Hair color is a phenotype.
<h3><u>Answer;</u></h3>
primary ecological succession
A glacier retreats exposing bare rock and allowing communities of organisms such as moss and lichens to move in. This is an example of <u>primary ecological succession.</u>
<h3><u>Explanation</u>;</h3>
- Primary succession is a type of succession that occurs following an opening of a pristine habitat, for example, a lava flow, an area left from retreated glacier, or abandoned strip mine.
- <em><u>Primary succession occurs in lifeless area; that is regions in which soil is incapable of sustaining life.</u></em>
- <em><u>The first organisms to appear in areas of primary succession are often mosses or lichens, often known as pioneer species because they are the first species present.</u></em>
