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Brilliant_brown [7]
4 years ago
8

What are the four factors that must be present for natural selection to act upon a population?

Biology
1 answer:
mr Goodwill [35]4 years ago
7 0

Answer:

im not sure what your questions is about it could be

1) mutation, gene flow, genetic drift, and natural selection

or

2)reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population.

Explanation:

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Sleet forms directly from which type of precipitation?
Julli [10]

Answer:

C

Explanation:

Sleet is pellets of ice that form when snow falls into a warm layer and melts into rain. The rain then falls into a freezing layer of air that is deep enough to refreeze the raindrops into pellets

7 0
3 years ago
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Which question cannot be tested with a scientific investigation?
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Answer:

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3 years ago
What do scientists use to divide the geologic time scale? Major divisions in the fossil records Major divisions in the sedimenta
IgorC [24]
The correct option is B: MAJOR DIVISIONS IN THE SEDIMENTARY ROCK LAYERS.
Geologic time scale refers to a system of chronological dating which relates geological strata to time. Geologic time scale is used by scientists to describe the timing of the events that had occurred in the past, thus the scale divides the earth history into units of varying magnitude. There are four basic block of time, these are eons, eras, periods and epochs.
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3 0
3 years ago
Which statement is false in reference to the cranial meninges?have the same basic structure as the spinal meningeshave three lay
earnstyle [38]

Answer:

The statement that says the cranial meninges have three layers of the dura mater is false.

Explanation:

The meninges are protective layers located between the central nervous system and its bone protection, both at the level of the brain and the spinal cord. The brain and spinal cord are surrounded by three membranous layers (cranial meninges), these are the dura mater, arachnoid mater and the pia mater, they are located one below the other.

The dura mater is the outermost strong fibrous tissue layer, formed by two layers of which the outermost one is attached to the bone and represents its periosteum. The innermost layer joins the arachnoid membrane. In addition to being the outermost meningeal, the dura mater is the hardest and most condensed of the three we have. Attached in part to the skull, this membrane protects the brain and acts as a structural support to the entire nervous system by dividing the cranial cavity into different cells.

The arachnoid mater, located in an intermediate zone between dura and pia mater, through this meninge and the space between arachnoid and pia mater it’s where the cerebrospinal fluid circulates; and protects the central nervous system against injuries.

The pia mater is the most internal, flexible meninge and in the greatest contact with the structures of the nervous system. In this layer you can find numerous blood vessels that supply the nervous system structures.

The spinal meninges are inside the spinal canal and encase the spinal cord. They have the same basic structure as the cranial meninges, composed of three layers: the dura mater, the arachnoid mater and the pia mater.

5 0
4 years ago
Explain why trees in temperate rainforest and tropical rainforest don’t lose their leaves. I need help plz someone help me !!!!
olga55 [171]

They don't lose their leaves because of the humidity in the forest.

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4 years ago
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