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True [87]
3 years ago
10

What is the sa node of the heart

Biology
1 answer:
olasank [31]3 years ago
5 0

Its a cluster of cells that are situated in the upper part of the wall of the right atrium.

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What can be said about the leading versus the lagging strand in dna population?
Naddika [18.5K]
The leading is replicated continuously for the entire length of the chromosome, while the lagging strand is replicated in pieces.
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Humans drill wells into Earth's crust to draw out groundwater for drinking and
lord [1]

Answer:

Biosphere, geosphere, hydrosphere

Explanation:

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Which of the following adaptations will probably develop most rapidly?
Paraphin [41]

Answer:

Mimicry

Explanation:

In mimicry, species evolve to resemble other species; in Müllerian mimicry this is a mutually beneficial co-evolution as each of a group of strongly defended species (such as wasps able to sting) come to advertise their defences in the same way. Features evolved for one purpose may be co-opted for a different one, as when the insulating feathers of dinosaurs were co-opted for bird flight.

Adaptation is related to biological fitness, which governs the rate of evolution as measured by change in gene frequencies. Often, two or more species co-adapt and co-evolve as they develop adaptations that interlock with those of the other species, such as with flowering plants and pollinating insects.

4 0
3 years ago
Which part of the nervouds system consists of the brain and spinal cord:
Damm [24]

Answer:

c. CNS

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The Central Nervous System (CNS) is responsible for receiving and transmitting information throughout the body. We can define it with the command center that coordinates the activities of the body.  It consists of the brain and spinal cord, which are protected by the skull and spine respectively.

Both structures are reinforced by three connective blades, called meninges. They are: dura mater, arachnoid and pia mater. Between the last two there is a fluid that is responsible for the nutrition of the CNS and the minimization of possible trauma caused by mechanical shocks.

7 0
3 years ago
Have soft internal body​
nikdorinn [45]
Okay...................goodnight I have a sugar crush<3

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