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Tanzania [10]
3 years ago
14

Which timeline best shows the history of the development of cell theory?

Biology
2 answers:
allsm [11]3 years ago
8 0

Answer:

The second image is the correct answer.

Explanation:

The cell was discovered by Rober Hooke when analyzing cork cuts under a microscope. He verified the presence of small spaces, which he called a cell, a word derived from the Latin cellula which means small compartment. After Hooke's analysis, several studies were developed in order to better understand the functioning of these structures. In 1676, Antonie van Leeuwenhoek analyzed some cells and realized that they were not just empty compartments, but had internal structures.

Studying animal and plant tissues, Theodor Schwann and Mathias Schleiden came to very similar conclusions about cells. They published their ideas independently and claimed that all organisms were made up of cells. There emerged the main pillar of Cell Theory.

In 1855, Rudolf Virchow, a German pathologist who agreed with Schwann and Schleiden's ideas, stated, after some studies, that all cells originated from pre-existing cells. The point highlighted by Virchow was also incorporated into cell theory.

mr_godi [17]3 years ago
4 0

i think in 1838 is the best one

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What contains genes that are the instructions for making proteins
Sonbull [250]

Answer:

What contains genes that are the instructions for making proteins

Explanation:

The DNA code contains instructions needed to make the proteins and molecules essential for our growth, development and health. DNA? provides instructions for making proteins

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Food webs such as the one shown were first used in 1927 by the animal ecologist charles elton. the food web below represents the
Schach [20]

Answer:

Zooplankton

Explanation:

The correct answer here would be the zooplankton. (see the attached image)

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3 years ago
Which of the following is not a sign of possible pest infestation?
Brrunno [24]

The right answer is smelly garbage.

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smelly garbage is not synonymous of infestation, because the olfactory system only detected smelly metabolites of these microorganisms. This does not necessarily mean that the microorganism has managed to penetrate the body.

By cons other proposals are signs and tools for infestation (torn packaging with food leaking out, dead insect bodysuits, feathers, and fur).

5 0
3 years ago
Read 2 more answers
I really need these!!
s2008m [1.1K]
1- Combustion reactions are exothermic reactions since these reactions result in the emission of heat (heat is a product and not a reactant)

2- A substance with higher specific heat that water would be liquid ammonia. This means that, for the same amount of energy given to both water and liquid ammonia, water will heat faster and gain more thermal energy (in degree celcius) that liquid ammonia.

3- Conduction : occurs when heat is directly transmitted from a material to another due to the difference in temperature between both. Examples are:
a- when using an iron the heat is transferred from the  iron to the piece of clothe being ironed
b- if you hold a hot cup heat will transfer to your hand
c- when you hold chocolate with your bare hand it will melt due to the transfer of heat from your hand to the chocolate
d- when you heat food on the stove the heat will transfer from the flame to the pan
e- when you hold ice it melts due to the transfer of heat from your hand to the ice piece
f- when you place hot liquid in a cup the heat will transfer from the liquid to the cup and the cup will become hot
g- if you place a spoon in a plate containing hot food the heat will be transferred from the food to the spoon making it hot
h- when you walk on the sand beach during summer the heat will be transferred from the sand to your feet and your feet will be hot
i- if you hold someone's hand when he/sh is cold the heat will be transferred from your hand to his/hers
j- Light bulbs emit heat, if you touch them this heat will be transferred to your body

4- Convection : is the transfer of heat through liquids or gases. Examples:
a- when water at the bottom of a pot is heated, it transfers this heat to the water above by convection
b- the process of ice melting when left in the air where heat is transferred from the air to the ice
c- the same goes for chocolate melting
d- cooling a frozen substance using running water where heat is transferred from the water to the frozen substance
e- when you stream a hot cup of tea/coffee, you transfer heat from the tea/coffee to the air
f- when a radiator moves the hot air upwards and the cold air downwards
g- when a balloon rises up wen being filled with hot air
h- when the ocean circulates and heat is transferred from warm water to cool water
i- when heat is transferred from a bulb to the surrounding air
j- when you cool the radiator of your car using water where water is transferred from the radiator to the water.

5- Radiation: the emission of energy in the form of waves. Examples:
a- the sunlight (ultraviolet radiations of sunlight)
b- x-rays
c- the flame/light of a candle
d- the gamma radiations from the explosion of a star
e- microwaves of a microwave oven
f- the radiations of the mobile phone which are electromagnetic radiations
g- the beam of a laser
h- placing your hand over warm fire
i- emission of alpha particles from decaying uranium
j- the radio waves
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