| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.09 |
| Score | 0% | 62% |
What part of the nervous system controls simple reflexes?
cerebrum |
|
medulla |
|
autonomic |
|
spinal cord |
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.
In the food chain, bacteria and fungi convert the organic matter in the dead bodies of plants and animals into simple nutrients. Bacteria and fungi are:
scavengers |
|
decomposers |
|
primary consumers |
|
producers |
Decomposers (saprotrophs) are organisms such as bacteria and fungi that break down the organic matter in the dead bodies of plants and animals into simple nutrients.
The Rh factor antigen in blood determines:
blood type |
|
universal donor status |
|
universal recipient status |
|
postive or negative |
Blood is categorized into four different types (A, B, AB, and O) based on the type of antigens found on the outside of the red blood cells. Additionally, each type can be negative or positive based on whether or not the cells have an antigen called the Rh factor.
Which of these is not a phase in cell division?
cytokinesis |
|
megaphase |
|
interphase |
|
anaphase |
Cell division is the process by which cells replicate genetic material in the nucleus and consists of several phases, beginning with interphase and ending with cytokinesis.
Which of the following is not a characteristic of the Sun?
is a yellow dwarf star |
|
formed 2.6 billion years ago |
|
is composed of hydrogen and helium |
|
makes up over 99% of the mass of the solar system |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.