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ioda
3 years ago
5

What are placoderms?

Biology
2 answers:
Romashka [77]3 years ago
7 0
An extinct class of prehistoric, armoured fish.
svet-max [94.6K]3 years ago
4 0
<span>an extinct fish of the Devonian period, having the front part of the body encased in broad flat bony plates.
</span>
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100 points please help me Explain why fat-free potato chips fried in artificial fats contain fewer calories than those fried in
ivolga24 [154]

Answer:

Yes

Explanation:

I would consider greatly my choices in trans fats after knowing this

7 0
3 years ago
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Nicotinic receptors a. are found at neuroeffector junctions of the parasympathetic nervous system. b. respond to epinephrine. c.
Verizon [17]

Answer:

Option C, open chemically gated sodium ion channels.

Explanation:

The nicotinic receptors are present on the muscle cell membrane. These receptors belong to the class of cholinergic receptor which binds to the acetylcholine and opens the gated channel to allow transfusion of cation through it. These actions of the receptors are stimulated by the neurotransmitter. Nicotinic receptors are very fast at acting and hence are more prevalent at the neuromuscular junction.

Hence, option  C is correct

 

5 0
3 years ago
Which statement is true about the relationship between carrying capacity and population size?
Tomtit [17]

Answer:

C

Explanation:

The carrying capacity is the amount of resources available to support a specific number of population size. in history, carrying capacity is almost always seen as independent, meaning that the species has no impact on the carrying size. However, this is wrong because we can increase our carrying capacity through the use of technology and standard of livng.

If the population is level is lower than the carrying capacity, then positive growth will occur.

7 0
3 years ago
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How does a water wheel do work (NOT how does water do work on a water wheel)?
lora16 [44]

Answer:

The falling force of the water pushes the paddles, rotating a wheel.This creates a special channel known as a mill race from the pond to the waterwheel.

Explanation:

A waterwheel is a type of device that takes advantage of flowing or falling water to generate power by using a set of paddles mounted around a wheel.  

3 0
3 years ago
Movements of water where density increase underwater causes deep currents
Norma-Jean [14]

they're called tides caused by the moon. the answer is tides

8 0
3 years ago
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