Cells were first observed through a simple microscope, which is the first option, as Antonie van Leeuwenhoek, a Dutch scientist, used a simple microscope that he designed and built himself to observe and describe microscopic organisms.
The history of the microscope goes back several centuries, with various scientists and inventors contributing to its development. One of the most notable figures in the history of microscopy is Antonie van Leeuwenhoek, who is considered the father of microbiology. He was a Dutch tradesman and amateur scientist who lived in the 17th century, and he was the first person to observe and describe microscopic organisms. Leeuwenhoek's microscope was a simple microscope, which means that it had only one lens. The lens was a small, spherical bead of glass that was mounted on a metal plate.
Hence, cells were first observed through a simple microscope, which is the first option.
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Answer:
Simple microscope
Explanation:
Answer:
The correct order is
5, 4 , 3, 2, 1
Explanation:
The first stage is the fusion of sperm with egg in fallopian tube which induces chemical reactions that prevents fusion of multiple sperm with one egg. This is known as preventing polyspermy.
After this the fused egg starts dividing and growing through the process of mitosis. The growing zygote reaches the stage of morula after few cell division and continues the division process till it reaches the stage of blastocyst.
The blastocyst now move down the fallopian tube to attach to the wall of uterus. This stage is known as implantation.
Hence, the correct order is 5, 4 , 3, 2, 1
Answer:
the purpose of testing whether the surface texture of the ground affects the distance an object can roll is to understand how different ground textures impact the movement of objects. By conducting this experiment, we can determine whether objects roll farther or shorter distances depending on the surface they roll on.
Explanation:
Answer:
Answer is D. Water has high specific heat.
1 calorie/gram °C or 4.186 joule/gram °C is the specific heat of water, which is high as compared to any other common substance. The high specific heat of water due hydrogen bonds present between water molecules. In order to increase temperature of water, this bond needs to be broken down. To break many hydrogen bonds, a larger amount of energy is required. when all the bonds are broken water is changed from liquid to gas( water vapor).
Explanation:
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3.urnine is finally expelled from the body through which of the following?
*Bladder
*Collecting duct
*Kidneys
*Urethra
4.What does the hemoglobin in red blood cells do?
*It binds carbon dioxide
*it binds oxygen
*it releases antibodies
*it releases carbon dioxide
5.what chamber of the heart pumps blood into the pulmonary artery, which leads to the lungs?
*The left atrium
*the left ventricle
*the right atrium
*the right ventricle
6.In which part of the circulatory system is blood brought directly to the tissues?
7.when a cell first takes in a virus, what organelles tries to destroy it?
8.what type of cells engulfs an invading pathogen and displays its antigens?
9.what is keratin?
10. what is the principle component of the thickest layer of the skin?
11.what is the tough protein that is one of the primary components of bones?
12.how many bones are contained in the adult body?
13.which of 6the following bones protects the spinal cord?
14. which of the following types of muscles are voluntary?
15.what is the role of the proteins actin and myosin?
16.where is insulin produced?
17.which of the following receptors respond best to dim light?
18.what is the hormone that causes secondary characteristics in males?
19. what are eggs produced in the female body?