Parasites are organisms that survive by harming anouther organism (feeding off of it, ex. tick, flea)
Answer:
Gastrula
Explanation:
A hollow shaped embryonic structure formed after two weeks of fertilization with three layers is known as gastrula.
The gastrula is formed from the repeated division of the single-layered structured called blastula which later forms three layers called ectoderm, endoderm and mesoderm.
These layers during the process of gastrulation from different organs of the multicellular organisms like the endoderm forms the liver, the ectoderm form the nervous system, the skeletal bone and many others.
Since gastrula structure contains three dermal layers therefore gastrula is the correct answer.
Answer:
Explanation:
Autonomic neurotransmitters are the chemicals that are involved in the transmission of the neural signals in tne autonomic nervous system .The autonomic nervous system consist of the sympathetic (adrenergic)and parasympathetic (cholinergic)system and the receptors are alpha,beta and muscarinic ,nicotinic respectively. These receptors are found at various sites and elicit a variety of actions in the body. The main neurotransmitter of the adrenergic system is the epinephrine or non epinephrine and for the cholinergic system is acetylcholine.
All preganglionic neurons use ACh as the neurotransmitter
With the mentioned details :
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I do not get it can you explain any better
<h2>Answer:</h2>
The option A is the correct option. The fungi share a mutualistic association with the trees.
<h3>Explanation:</h3>
Mutualism or interspecific cooperation is the way two organisms of different species exist in a relationship in which each individual fitness benefits from the activity of the other. And in this case, both plant and fungi are benefited by each other. The plant provides food and habitat for the living of fungi and fungi, in turn, decompose dead organic matter to provide simple compounds to plants.
While in commensalism only one either plant or fungi can be benefited. And it is also not a parasitic interaction.
