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Simora [160]
3 years ago
6

_____ are frequent intense aches of the head or neck that are not caused by another physical disorder.

Biology
1 answer:
vlabodo [156]3 years ago
5 0

Migraines are frequent intense aches of the head of neck that are not caused by another physical disorder. Severe pain may usually be felt on either one side or both sides of the head. Pain usually is felt in the temples. Migraine could last for hours or couple of days. 

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A _______cross explores two traits.<br> dihybrid<br> monohybrid<br> multihybrid<br> hybrid
Cloud [144]

Answer:

<em>The correct option is A. dihybrid</em>

Explanation:

A cross is drawn to generate the possible outcomes of traits being passed from parents to offsprings.

A monohybrid cross can be described as a cross in which only one trait is studied. For example, just studying the trait for eye colour.

A dihybrid cross can be described as a cross in which two traits are studies in a single cross. For example, studying the traits for eye colour and skin colour.

5 0
3 years ago
¿a que llamamos uniones químicas?
Charra [1.4K]

Answer:

enlace iónico.

Explanation:

5 0
3 years ago
Protozoans are the only organisms that can convert nitrogen from the air into chemical compounds that plants can use.
tigry1 [53]

Answer: False

Explanation:

Protozoans are not the organism that fix nitrogen for the plants. The organism that fix nitrogen to convert it into a form which can be used by plants are known as diazotrophs.

These are bacteria and archae that fix nitrogen gas found in the atmosphere into more usable form such as ammonia.

These organism can grow without any external source of fixed nitrogen. Example: Rhizobia and azospirillium.

5 0
3 years ago
Differentiate between cell mass and cell number
sergiy2304 [10]

Answer:

Measurement (Count) of Cell Numbers:

1. Breed Method:

A known volume of microbial cell suspension (0.01 ml) is spread uniformly over a glass slide covering a specific area (1 sq. cm). The smear is then fixed by heating, stained, examined under oil immersion lens, and the cells are counted.

Customarily, cells in a few microscopic fields are counted because it is not possible to scan the entire area of smear. The counting of total number of cells is determined by calculating the total number of microscopic fields per one square cm. area of the smear.

6 0
2 years ago
Read 2 more answers
Which cells of the nervous system protect the cns by phagocytosing viruses, microorganisms, and tumor cells?
alexandr402 [8]
The correct answer is microglia.
<span>Microglia is glial cells found in the central nervous system with the protective role. Because they are the resident macrophage cells, they act as the first and main form of active immune defense. Microglia is constantly cleaning the CNS for plaques, damaged or unnecessary neurons, and infectious agents, like viruses or other microorganisms.</span>
3 0
3 years ago
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