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garri49 [273]
3 years ago
14

How many species do scientist think are on earth

Biology
1 answer:
german3 years ago
5 0

Answer: a lot or. There is over 5 sapiebs

Explanation: They are still looking for then

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How does the structure of each type of neuron relate to its function in the nervous system?
Sonbull [250]

Answer:

Motor neurons:

A. Function:

It relay messages coming from the brain or spinal cord to the muscles or organs.

B. Structure:

●Presence of long axons due to long distances the signals have to travel to the muscle its stimulating.

●It's myelinated, to assist the signal in travelling long distances as soon as possible.

Sensory neurons:

A. Function: its sensory receptors respond to stimuli by converting it into an electrical signal to the brain or spinal cord.

B. Structure:

●Presence of long dendrites / axons

● its myelinated

●since it's found in the middle of the neuron it forms ganglia that unites in the spinal cord and aid in involuntary reflexes.

Interneurons:

Structure:

● shorter than motor or sensory neurons

● has branches, a lot of branches consisting of axons and dendrites off the cell body to enable multiple simultaneous between neurons

● It's body is partially myelinated.

●occurs in large clusters of neurons to compensate for its partial myelination to speed up the signal

8 0
3 years ago
What is a stem cell?
expeople1 [14]
An undifferentiated cell of a multicellular organism which is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.
8 0
3 years ago
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Different ratios occur in crosses with single gene pairs or two gene pairs. What types of ratios are likely to occur in crosses
likoan [24]

Answer:

Genotype ratio: 1, 1:1, 1:2:1

Phenotype ratio: 1, 3:1

Explanation:

Single gene pair cross is also known as monohybrid cross. This means that only one gene usually with two alleles is observed and it express one trait.

For example, if we name the gene for a certain trait with A, the possible genotypes are AA (dominant homozygous), aa (recessive homozygous) and Aa (heterozygous). Possible crosses are:

P: AA  x  AA

F1 : all of them are AA

The same is with aa x aa (all of the offspring are with aa genotype)

P: AA  x  Aa

F1: AA Aa AA Aa  (genotype ratio 1:1) (phenotype ratio 3:1)

The same genotype ratio is  in aa x Aa (offspring will have aa Aa aa Aa-(genotype ratio 1:1) (phenotype ratio 1:1)

P: Aa x Aa

F1: AA Aa Aa aa (genotype ratio 1:2:1) (phenotype ratio 3:1)

P: AA x aa

F1: Aa Aa Aa Aa (1)

5 0
3 years ago
Scissors are considered a compound machine because ____________.
Pie
Scissors change the magnitude or direction of a force without any motor.
6 0
3 years ago
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What is it called when the sun is directly overhead the tropic of cancer
Jet001 [13]
It is called Summer Solstice.
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