Which microscope did Anton van Leeuwenhoek use to observe single-celled organisms

Answers

Answer 1

Answer: the microscope that Anton van Leeuwenhoek use to observe single-celled organisms is : a very simple microscope, which is the type of microscope that only has one lens. Anton van leeuwenhoek conducted his studies in the 1600s. During that time period, we haven't developed any type of high-end microscope that exist today

Answer 2

Answer: A.) Simple microscope

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What is pericardium. Name the instrument used to measure blood pressure .

Answers

It is a double membrane outer covering of the heart ,,outer membrane is fibrous while inner is serous...
The instrument used to measure blood pressure is Sphygmomanometer...

Pericardium, the pericardium or pericardial, which surrounds the heart and the heart together with the main blood vessels (aorta, vena cava, etc..) Double-walled sac that covers the roots.

sphygmomanometer

Thale cress is a plant that is genetically engineered with genes that break down toxic materials. Which type of organism is described?

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Thale cress (Arabidopsis thaliana) is a small flowering plant belongs to the kingdom Plantae under the Angiosperms. It belong to Eudicots. It is also known as mouse-ear cress or arabidopsis . it is a popular model organism in Botany and genetics. Even if it is a complex multicellular eukaryote, it has a relatively small genome and have the smallest genome in all flowering plants.

Answer:

transgenic yeeeeeeep

Fossil fuels currently account for the majority of the world’s energy use because they are ____. A. distributed evenly throughout the world B. nonpolluting C. relatively inexpensive and readily available D. renewable energy resources

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You can answer the question by knowing that A) , B), and D are false. They are non-renewable (wind power is renewable), they are for example more present in Saudi Arabia than on other countries and they are very polluting, which is why we try to limit their use.

Therefore the correct answer is C.

Why is carbon so abundant in living things when oxygen is the most abundant element on Earth? Carbon atoms can bond with one another to make chains and cyclic structures whereas oxygen atoms cannot form chains or cyclic structures.
Carbon atoms are found in compounds that are solids at room temperature whereas oxygen atoms are found in compounds that form gases
Carbon atoms have lower mass than oxygen atoms, which keeps the masses of living things within desirable limits.
Carbon atoms are more stable than oxygen atoms, which allows living things to have more stable compositions.

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Carbon is so abundant in living things even though oxygen is the most abundant element on Earth because carbon atoms can bond with one another to make chains and cyclic structures whereas oxygen atoms cannot form chains or cyclic structures.
The correct answer is the first option.

Which part of the female reproductive system is responsible for producing egg cells?vagina
uterus
fallopian tubes
ovaries

Answers

Answer:

Ovaries

Explanation:

The female reproductive system is formed by the gonads (ovaries) that produce the egg cells, the fallopian tubes, which carry the eggs from the ovary to the uterus and protect them, the uterus where the embryo will develop if fertilized, the vagina and the vulva.

The ovaries are responsible for producing egg cells.

Can two species have the same niche

Answers

Of course they can! They almost all the time do

Answer:

The competitive exclusion principle tells us that two species can't have exactly the same niche in a habitat and stably coexist. That's because species with identical niches also have identical needs, which means they would compete for precisely the same resources.

Explanation:

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Which of the following is a TRUE statement regarding the skeletal system? There are 28 vertebrae that cover the spinal cord. There are 14 pairs of rib bones that make up the thorax. There are 10 major facial bones. There are 3 components to the sternum bone.

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