<span>a. Fish have a single central heart; earthworms have several hearts.
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Multi cellular organisms are made up of billions of cells each specialized to a unique role and these cells are organized into structural and functional units such as tissues and organs.
For each cell and organ to function optimally, it requires oxygen and nutrients and needs carbon dioxide and metabolic waste taken away in a continuous, never ending process.
<span>A mechanism is needed to accomplish the important function of transporting the relevant materials to and from the cell. The circulatory system fits this bill splendidly. It is a specialized organ system which allows blood and lymph to flow through the entire body carrying nutrients such as glucose, amino acids and electrolytes as well as oxygen to each cell, at the same time carting away carbon dioxide and all sorts of metabolic waste over to excretory organs to be expelled from the body.
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Answer:
Rhodopsin is the photopigment in rods.
Answer:
b. False
Explanation:
All living organisms such as plants and animals require energy to function properly (life activities). Thus, the organelle where energy from nutrients is released is generally referred to as mitochondria. Animals retrieve energy using mitochondria to do cellular respiration because they typically act like a digestive system by taking in nutrients, breaking them down and obtaining energy rich molecules for cell-life activities.
Cellular respiration can be defined as a series of metabolic reactions that typically occur in cells so as to produce energy in the form of adenosine triphosphate (ATP). During cellular respiration, high energy intermediates are created that can then be oxidized to make adenosine triphosphate (ATP). These intermediary products are produced at the glycolysis and citric acid cycle stage.
Basically, mitochondria is one of the cell organelles found in all living organisms and it is known as the powerhouse. Therefore, mitochondria provides all the energy required in the cell by transforming energy forms through series of chemical reactions; breaking down of glucose into Adenosine Triphosphate (ATP) used for providing energy for cellular activities in the body of living organisms.
Hence, during respiration, most ATP is formed as a direct result of the net movement of protons down a concentration gradient but not potassium against a concentration gradient potassium.
Answer:
D. antigen only come from microbes
Explanation:
Antigens are substances which elicits a response by the antibodies. Antigens Antigens include proteins, nucleic acids, lipoproteins, glycoproteins, and certain large polysaccharides.
They parts of antigen molecules that initiate immune responses are called epitopes or antigenic determinants.
Answer:
African Honeybee:
Phylum: Arthropoda
Species: Apis mellifera
Genus: Apis
Kingdom: Animalia
Order: Hymenoptera
Class: Insecta
Tribe: Apini
Grasshopper:
Phylum: Arthropoda
Informal group: Acridomorpha; Dirsh, 1966
Kingdom: Animalia
Class: Insecta
Order: Orthoptera
Black Widow Spider:
Scientific name: Latrodectus
Length: Southern black widow: 1.5 in.
Class: Arachnida
Order: Spider
Phylum: Arthropoda
Mosquito:
Scientific name: Culicidae
Order: Diptera
Class: Insecta
Speed: 1 – 1.5 mph
Clutch size: 100 – 200
Yellow Jacket:
Phylum: Arthropoda
Family: Vespidae
Genus: Vespula or Dolichovespula
Order: Hymenoptera
Class: Insecta
Kingdom: Animalia
I hope this helped you
