When a stimulus is produced it signifies the production of sensation in the sensory organs. This sensation through the sensory organs (eyes, ears, nose, skin and tongue) is sent to the sensory nerve connected to these sense organs. These sensory nerves send nerve impulses through the nerve fiber to the spinal cord. From the spinal cord the nerve impulse is transferred to motor nerves.
The motor nerve then sends response to the stimulus though the same path to the region from which stimulus was received and thus the body responds through muscular activity. Such as removal of heat from the heated object if heated sensations were received.
Answer:
D. do cows milk and goats milk contain different nutrients
A. nitrogen; because it’s healthy to drink
The lowest trophic level in an ecosystem is occupied by producers or autotrophs also known as plants.
<h2>Further Explanation;
</h2><h3>Trophic levels </h3>
- Trophic levels are the positions that organisms occupy in a food chain within an ecosystem. It represents the feeding positions of organisms in a given ecosystem.
- The first trophic level is occupied by autotrophs or producers.
- Autotrophs are those organisms that can make their own food using energy from the sun through the process of photosynthesis.
- Examples of autotrophs are plants and green algae. Organisms in the first trophic levels are known as primary producers.
- The second trophic level is composed of organisms known as primary consumers which feed on the producers to obtain energy they need to live.
- These organisms are known as herbivores and cannot make their own food but obtain the already made food by the producers. Examples are; antelopes, cows, rabbits, etc.
- The third trophic level consists organisms known as secondary consumers which obtain nutrients by feeding on the primary consumers. These organisms are known as carnivores and include, lions, foxes, etc.
- Fourth trophic level is made up of tertiary consumers which obtain food by feeding on the secondary consumers.
- Animals in this level receive less energy compared to other levels since some energy is lost at each level due to processes such as excretion in the form of heat.
- Fifth trophic level is made up of animals known as apex predators which are at the top of the food chain since they don’t have natural predators.
Keywords: Trophic levels, autotrophs, consumers
<h3>Learn more about:
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Level: High school
Subject: Biology
Topic: Ecology
Sub-topic: Food chain
