I think that 6 is B, 7 is C, and 8 is also B
Answer:
bacteria
Explanation:
In the most extreme environments on the planet, such as the surroundings of a volcano, we imagine an extremely hot and toxic place, a desolate place that is not conducive to life. In salt deserts the same image is repeated. However, this first impression may lead us to mistake, these environments have been shown to be rich in life, populated by organisms called extremophiles, which is a group composed of bacteria.
Answer:
Water is sticky and clumps together into drops because of its cohesive properties, but chemistry and electricity are involved at a more detailed level to make this possible. More precisely, the positive and negative charges of the hydrogen and oxygen atoms that make up water molecules makes them attracted to each other.
Explanation:
The basic building block of all minerals is the _____________. Select one: a. silicon tetrahedron b. silica tetrahedron c. silicone tetrahedron d. silicate tetrahedron
The right answer to this question is option b – silicate tetrahedron. It is the major constituent of the silica minerals. The structure of silica tetrahedron consists of one silica atom surrounded by four atoms of oxygen. It is found in all silica minerals and is very strong and stable combination that forms the structure of the minerals by sharing oxygen at its corner. Silicon has 14 electrons, of which two electron lies in the innermost cell, 8 lies in the next shell and the rest 4 are known as valence shell. Thus it interacts with oxygen to fill its valence shell as oxygen is a strong oxidizer. Each of oxygen’s in the tetrahedron shares one electron from the silicon atom in a covalent bond, so the resulting oxygen atom is an anion with one negative charge. Thus, four negative charges, SiO44– exists in a tetrahedron structure
Answer:
Adrenal medulla
Explanation:
Fight-or-flight or acute stress response is marked by physical changes, including nervous and endocrine changes, that prepare human or an animal to react or retreat. This response was first discovered by an American Physiologist, Walter Bradford Cannon.
In response to an acute stress, an area of the brain called AMYGDALA sends an emergency signal to the HYPOTHALAMUS, which acts like a command center and activates the body's sympathetic nervous system by releasing hormones. The sympathetic nervous system stimulate the adrenal medulla gland, triggering the release of CATECHOLAMINES (Epinephrine/adrenaline and Norepinephrine/noradrenaline) into the bloodstream.
This release induces several physiological changes in the body; The heart beats faster than normal; pushing blood to the muscles, heart and the vital organs, increased in blood pressure, blood sugar (glucose) are released into the bloodstream to give us the extra energy we need.
