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kvv77 [185]
3 years ago
15

Part 1: Describe the mass and surface temperature of the main sequence stars.

Biology
1 answer:
andrew-mc [135]3 years ago
6 0

Answer:

Main sequence is when a star is burning hydrogen in its core. The luminosity and temperature of a main-sequence star are set by its mass. More massive means brighter and hotter. A ten solar mass star has about ten times the sun's supply of nuclear energy.

The main sequence stretching from the upper left (hot, luminous stars) to the bottom right (cool, faint stars) dominates the HR diagram. It is here that stars spend about 90% of their lives burning hydrogen into helium in their cores.

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A valid scientific investigation must be able to be
san4es73 [151]
Answer: in order for a scientific investigation to be valid A hypothesis must be tested throughout a Scientific investigation that can gather evidence and support it.

Explanation: in any scientific investigation you have to have a testable hypothesis, without your hypothesis it’s not really a scientific investigation.


Hope this helped!
7 0
3 years ago
Give an example of spinal reflex and explain how the nervous system functions in this reflex action
Bad White [126]

The patellar reflex is the most common example or a spinal reflex. When the knee is tapped, the nerve that will receives this stimulus sends an impulse to the spinal cord and relay it to the motor nerve. This sources the quadriceps muscle at the front of the thigh to contract and twitch up the leg. This reflex contains simply two nerves and one synapse. The leg will start to twitch up on the other hand the brain is just suitable aware of the tap and comprehends the situation. <span>Subsequently the tap, the leg is routinely lengthy once and comes to rest. The nonappearance of this reflex is problematical and recognized as westphals sign this reflex might be lessened or absent in lower motor neuron lesions and during sleep. </span>

3 0
3 years ago
Can someone solve this asap please
Butoxors [25]

The answers are hopefully in the image

5 0
2 years ago
Graves’ Disease is an autoimmune disorder that causes an overproduction of the hormone produced in the thyroid. These hormones a
Alex Ar [27]

Answer:

Explanation:

Graves' disease is an autoimmune disorder in which antibodies produced by your immune system stimulate your thyroid to produce too much T4. It's the most common cause of hyperthyroidism. Hyperfunctioning thyroid nodules (toxic adenoma, toxic multinodular goiter or Plummer's disease).

8 0
3 years ago
If a double-stranded segment of DNA has been found to have 23 purines and 15 thymines, how many guanines are there?
Serggg [28]

Answer: 4 Guanines

Explanation: Following Chargaff's ratio that describes the ration of purines to pyrimidines as 1:1, if there are 23 purines, it follows that there should be 23 pyrimidines; 15 Thymines should therefore be hydrogen bonded to 15 Adenines by complementary base pairing.

We are then left with 8 nucleotides composed of guanines and cytosines in complementary base pairs. This means that half that number (4) should be guanines and the rest cytosines.

8 0
3 years ago
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