Insects breathe through small, paired holes called spiracles, which open into the tracheae. Tracheae and tracheoles deliver oxygen directly to air sacs and tissue cells and carry away carbon dioxide. A fish's respiratory system is a pump mechanism.
2. earthworm-
The reason behind their moist skin is that earthworm's breathing organ is their skin. Air can easily pass through the skin of an earthworm. The exchange of gases usually takes place through its moist skin and capillaries.
In chemistry, there are three definitions in common use of the word base, known as Arrhenius bases, Brønsted bases, and Lewis bases. All definitions agree that bases are substances that react with acids, as originally proposed by G.-F. Rouelle in the mid-18th century.
In 1884, Svante Arrhenius proposed that a base is a substance which dissociates in aqueous solution to form Hydroxide ions OH−. These ions can react with hydrogen ions (H+ according to Arrhenius) from the dissociation of acids to form water in an acid–base reaction. A base was therefore a metal hydroxide such as NaOH or Ca(OH)2. Such aqueous hydroxide solutions were also described by certain characteristic properties. They are slippery to the touch, can taste bitter[1] and change the color of pH indicators (e.g., turn red litmus paper blue).
In water, by altering the autoionization equilibrium, bases yie
Answers & Comments
1. insect and fish -
Insects breathe through small, paired holes called spiracles, which open into the tracheae. Tracheae and tracheoles deliver oxygen directly to air sacs and tissue cells and carry away carbon dioxide. A fish's respiratory system is a pump mechanism.
2. earthworm -
The reason behind their moist skin is that earthworm's breathing organ is their skin. Air can easily pass through the skin of an earthworm. The exchange of gases usually takes place through its moist skin and capillaries.
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Verified answer
Answer:
Explanation:
In chemistry, there are three definitions in common use of the word base, known as Arrhenius bases, Brønsted bases, and Lewis bases. All definitions agree that bases are substances that react with acids, as originally proposed by G.-F. Rouelle in the mid-18th century.
In 1884, Svante Arrhenius proposed that a base is a substance which dissociates in aqueous solution to form Hydroxide ions OH−. These ions can react with hydrogen ions (H+ according to Arrhenius) from the dissociation of acids to form water in an acid–base reaction. A base was therefore a metal hydroxide such as NaOH or Ca(OH)2. Such aqueous hydroxide solutions were also described by certain characteristic properties. They are slippery to the touch, can taste bitter[1] and change the color of pH indicators (e.g., turn red litmus paper blue).
In water, by altering the autoionization equilibrium, bases yie