Answer;
- Sensory receptors
After receiving a stimulus, the sensory receptors send(s) signals to the appropriate area of the body.
Explanation;
-Sensory receptors are structures that reacts to a physical stimulus in the environment, whether internal or external. They are sensory nerve endings that receives information and conducts a process of generating nerve impulses to be transmitted to the brain for interpretation and perception.
-The sensory receptors include those for tactile sensations, such as touch, pain, and temperature, as well as those for vision, hearing, smell, and taste.
(1) simple, single-celled organisms
(2) simple, multicellular organisms
(3) complex, single-celled organisms
(4) complex, multicellular organisms
Many scientists believe that life on Earth started with simple, single-celled organisms. Therefore, the correct statement is option A.
Single-celled organisms are unicellular organisms that contain only one cell and form the most ancient part of life. They can be prokaryotic or eukaryotic organisms.
Life on earth began with simple, single-celled organisms which are usually prokaryotes, such as bacteria and constitutes the most abundant type of organisms on earth. Prokaryotes lack a nucleus and membrane-bound organelles.
By this time, these single-celled organisms evolved to form more complex organisms. Multicellular organisms first evolved around 1 billion years ago, but they are still considered simple to the organisms present today.
Therefore, simple, single-celled organisms are the first to live on earth billions of years ago.
Learn more about single celled organisms here:
#SPJ3
Answer:
Chloroplast
Explanation:
Chloroplasts are organelles, small organs of plant cells, and other organisms capable of photosynthesis, such as algae.
They are green in color because of the presence of chlorophyll. It is in chloroplasts that the chemical reactions of photosynthesis occur.
In addition, these structures have DNA, RNA and ribosomes, so they can multiply and synthesize proteins naturally.
A chloroplast is a type of plastid in plants that contains chlorophyll for photosynthesis. This process uses sunlight, carbon dioxide, and water to produce glucose and oxygen. The chlorophyll appears green because it absorbs blue and red wavelengths of light but reflects green.
The plastid with chlorophyll in plants that photosynthesize is called a chloroplast. Chloroplasts are plant cell organelles that contain a green pigment called chlorophyll, which captures the energy of sunlight for photosynthesis. This process involves a series of reactions that use carbon dioxide, water, and light energy to make glucose and oxygen.
Photosynthetic eukaryotes, including plants and some protists, possess these chloroplasts. However, some bacteria also perform photosynthesis, but their chlorophyll is not located in chloroplasts but instead, within the cell itself.
All photosynthetic organisms contain a pigment called chlorophyll a, which humans perceive as green. This is because it absorbs wavelengths from either end of the visible spectrum (blue and red), but not green, which is reflected, making chlorophyll appear green.
#SPJ5
B) Different species share the same space.
C) A population is divided.
D) A major change on earth takes place.
2. Which of the following must be true of their individuals if two populations are no longer the same species?
A) They do not have any of the same genes.
B) They do not share any of the same space.
C) They do not resemble each other at all.
D) They cannot reproduce successfully with each other.
3. How does speciation start to take place on a genetic level between two isolated populations?
A) Large numbers of mutations occur.
B) Allele frequencies change in different ways.
C) New genes are added to one group.
D) Recessive alleles become dominant.
The 3rd question is actually B. Allele frequencies change in different ways
B. external fertilization and the development of offspring outside the mother's body
C. internal fertilization and the development of an embryo within the female body without nourishment from the mother
B. The lower the concentration of hydrogen ions, the higher the acidity is.
C. The greater the concentration of hydroxide ions, the higher the acidity is.
D. The greater the pH is, the lower the acidity is.
The pH scale measures the acidity or basicity of a solution. The higher the pH, the lower the acidity and the lower the pH, the higher the acidity. It is based on hydrogen ion concentration.
The pH scale is a logarithmic scale used to specify the acidity or basicity of an aqueous solution. It ranges from 0 to 14. A solution with a pH less than 7 is acidic, one with a pH of 7 is neutral, and one with a pH greater than 7 is basic. Therefore, option D is the correct answer. The greater the pH is, the lower the acidity is. The lower the pH, the higher the acidity, and vice versa. This scale is based on the concentration of hydrogen ions (H+) and hydroxide ions (OH-).
#SPJ6
Answer:
1) Conduction.
Heat transfers to a spoon as the heat energy is passed from the coffee to the spoon through conduction.
2) Radiation
The heat on the glass surface gets radiated into the chair which causes the chair to warm up.
3) Convection
The globs are hot and less dense, which rises to the top whereas the cold globs are more dense which causes it to settle down.
1. Hot coffee warms the spoon through conduction,
2. a chair warms through radiation from the fireplace,
3. decorative lamp globs rise through convection.
1. Hot coffee is stirred with a spoon, the spoon gets hot due to conduction.
2. A chair is placed several feet from a fire in a fireplace. The fireplace has a glass screen. The side of the chair facing the fireplace gets warm because of radiation.
3. A certain type of decorative lamp contains colored liquids. These liquids form globs that break off and rise to the top of the liquid. The globs rise due to convection.
#SPJ3