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topjm [15]
3 years ago
7

When do scientists believe life originated on Earth?

Biology
1 answer:
skad [1K]3 years ago
6 0
A. 3.7 billion years ago
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Geologists studying a local rock formation measure the amount of matter in the rock. This measurement is known as the rock's ___
Elenna [48]

Answer:

Mass

Explanation:

Mass is defined as the amount of matter in a substance. It is usually measured by balances such as the beam balance and scales. It is measured in grams or kilograms depending on the size of the body.

The process of Rock formation involves how a rock is formed which is usually by sedimentation or cooling of magma in volcanic eruptions. In rock formation study,the geologist measures the mass of the rock which enables knowledge of the amount of matter in the rock. This is be used to determine the weight of the rock and the rock type and properties.

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How was bacteria first discovered?
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Bacteria were first observed by the Dutch microscopist Antonie van Leeuwenhoek in 1676

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3 years ago
Each of the following complications listed below is a result of a homeostatic calcium imbalance. Which would not be life threate
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Answer:

The correct option is number 3.  A deficit of appositional bone growth would not be life threatening.

Explanation:

Appositional bone growth can be defined as the thickening of the bones due to increase in the number of bone tissues at the surface. In this kind of bone growth, the diameter of the bone increases rather than the length of the bone. This can lead to deformation of the bone but it is not life-threatening.

Rest of the options 1, 2 and 3 are serious disorders and can eventually lead to death.

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Which of the following processes help a plant conserve water?
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How do scientists determine the toxicity of a chemical
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Answer:

Toxicity can be measured by the effect the substance has on an organism, a tissue or a cell. We know that individuals will respond differently to the same dose of a substance because of a number of factors including their gender, age and body weight. Therefore a population-level measure of toxicity is often used

Explanation:

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