Metals
<span>Characteristics:
Solid--> 1 exception mercury
Shiny
Malleable--> can be shaped
Ducktile--> drawn into wire
**they easily lose or give up their electrons</span>
Non-metals
<span>Characteristics:
Gasses
Do not conduct electricity
** they gain or share electrons</span>
Metalloids
<span>Characteristics:
Can not conduct electricity.
Have properties between metals and non-metals.
Semiconductors</span>
Answer:
a. heart development.
Explanation:
As the third week of fetal development starts, the process of formation of blood vessels begins. Also, the splanchnic mesoderm in the head end of the embryo forms heart on days 18 and 19. Since it develops heart, this part of the mesodermal cells is called the cardiogenic area. The underlying endoderm sends the induction signals to these mesodermal cells to form a pair of endocardial tubes that gradually develop into a single primitive heart tube.
This primitive heart begins to beat by the end of the third week of development. Therefore, any drug that affects fetal development during the first 20 days of the pregnancy might affect the development of the heart.
Its a ball and socket joint.
D. because White paper reflects all of the light that hits it. Whatever color that light is, the paper appears to be that color, since paper of that color would reflect only that color if white light was shone on it. That is, blue paper reflects the same color when white light is shone on it as white paper does when blue is shone on it.
cells, tissues, organs, organ systems
The function of an organ system depends on the integrated activity of its organs