BIOLOGY HIGH SCHOOL

Jill is preparing to cook a family dinner, and she begins by gathering ingredients for themain course and dessert. She realizes that most ingredients go through both physical
and chemical changes as they cook.
One of the ingredients for her main course undergoes physical changes. Which of the
following is a physical change?
boiling water
cooking eggs
O grilling hamburgers
O baking bread

Answers

Answer 1
Answer:

Boiling water is an example of physical change as it does not cause any change in the chemical composition of water.

What are physical changes?

Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.

Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.

They involve only rearrangement of atoms and are often characterized to be changes which are reversible.

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Answer 2
Answer:

Answer:

Boiling water

Explanation:

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Placental mammals develop _______ A) In an egg laid in water B) A pouch of their mother's body C) Inside the mother's body**** D) Inside an amniotic egg

Answers

quite sure C is correct ;) remember that humans are also placental mammals.

Transcribed image text: Effect of flow tube Length 4. How does increasing the flow tube length affect fluid flow? Explain why changing blood vessel length would or would not be a reasonable method for the body to control blood flow. Effect of Pressure 5. How does decreasing the pressure affect fluid flow? Describe what happens to pressure and flow during exercise and explain why they change in that way. Effect of Stroke Volume 6. Cardiac Output = Stroke Volume x Heart Rate a) What happened to the pump's rate as its stroke volume was increased? What happened to cardiac output? b) What do you think might happen to the pressure in the pump during filling if the valve in the right flow tube became leaky?

Answers

Increasing the flow tube length decreases fluid flow. Changing blood vessel length would not be a reasonable method for the body to control blood flow because it would require significant energy and time. Decreasing the pressure decreases fluid flow. During exercise, pressure and flow increase because the body needs more oxygen and nutrients. Increasing stroke volume increases cardiac output. If the valve in the right flow tube became leaky, the pressure in the pump during filling would decrease.

Geometric shapes best represents the change in energy and change in biomass from one tropic level to the next?

Answers

The right answer for the question that is being asked and shown above is that:"TRUE." Geometric shapes best represents the change in energy and change in biomass from one tropic level to the next. They are very useful indication that there is a change.

What are stacks of thylakoids are called?

Answers

they re called granum singular and grana plural

Answer:

usa testprep got u

granum you will thank me latter

Explanation:

Under a light microscope, a stained cell shows chromosomes lined up along the middle. What will happen next? Spindles will form and centrioles will move to opposite poles. A nuclear membrane will form around each set of chromosomes. Chromosomes will separate and move to opposite poles.

Answers

Chromosomes will separate and move to opposite poles.

A light microscope uses focused light and lenses to magnify an object. Light microscopes come in several forms. (1) Simple light microscopes use a single lens to magnify an object and cannot reach high magnification just like a handheld lens whose highest clear magnification in the best conditions is 25x. (2) Compound light microscopes use two sets of lenses - an objective lens and an eye piece. This is the type of light microscope whose magnification power reaches between 1000x and 2000x.

Begins cell divison with 92 chromatids is that meiosis or mitosis ?

Answers

Meiosis is the process of cell division that starts with 92 chromatids, hence the correct answer is meiosis.

Cell division known as meiosis creates four daughter cells with half as many chromosomes as the parent cell. This is crucial for sexual reproduction because it enables the progeny to have a diverse chromosomal makeup from their parents.

Meiosis I and Meiosis II are the two stages of meiosis. The chromosomes multiply during meiosis I but do not split. As a result, each daughter cell has 92 chromatids; yet, they are still joined at the centromere.

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That is Meiosis. Here is a picture to Help. 

I hope this helps ^_^ 

~Renee 
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