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loris [4]
3 years ago
7

What types of organisms were first placed in the kingdom Protista?

Biology
1 answer:
mezya [45]3 years ago
4 0

<span>A</span><span>ll microorganisms is the answer</span>

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In the context of sensory receptors, the intensity of the stimulus is communicated to the brain by varying the _____ of the acti
Ipatiy [6.2K]
The answer to this question would be: frequency

The higher intensity of the stimulus, the higher frequency of the action potential will be sent. The nerve can't send a higher action potential, so it firing at higher at higher intensity instead. So when you felt an intense pain, that means the pain receptor is firing more stimulus per second compared to low or mild pain.
8 0
3 years ago
A metal body of mass 81 g occupies a volume of 30 cm3. Identify the metal.
Cerrena [4.2K]

Answer:

Aluminum

Explanation:

The density of Aluminum is 2.7 g/cm3

We know the volume and mass of the unknown metal, as density is mass/volume:  81g/30cm3 = 2.7 g/cm3 which is the density of Aluminum :)

8 0
3 years ago
Read 2 more answers
What part of the amniotic egg provides food for the embryo?
aev [14]

it would be C the yolk because


8 0
3 years ago
Read 2 more answers
Choose the pure substance from the list below.
arsen [322]
A, B, D, and E are all wrong. C is the right answer. C is a compound.
A, B, D and E are not unique. A pure substance is something with unique characteristics and if it can be broken down, the result is two or more pure substances. AKA only compounds and elements. This is an easy question so try to study. 
5 0
3 years ago
Place the events in order of sympathetic motor pathway. 1. postganglionic neuron depolarizes 2. acetylcholine binds to sweat gla
Ipatiy [6.2K]

Answer: 1, 3, 5, 2, 6, 4

Explanation:

The sympathetic nervous system stimulates many parts of the body for action during times of danger.

This signalling starts when the postganglionic neuron depolarizes, and postganglionic neuron releases acetylcholine, then the acetylcholine binds to nicotinic receptor in order to transmit impulse, and further the acetylcholine binds to sweat gland’s muscarinic receptor to disrupt or inactivate the action of acetylcholine. Finally, the neuron releases acetylcholine, and the neuron exits lumbar segment of spinal cord.

The danger has now been fully interpreted.

6 0
3 years ago
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