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serg [7]
3 years ago
9

When and how do scientists think sponges evolved?

Biology
2 answers:
solniwko [45]3 years ago
7 0
<span>They are stuck to the floor in the oceans, sea, and rivers. They are known as Porifera. The Poriferans are simple multi cellular animals. </span>Sponges<span> are very primitive creatures that scientist think </span>evolved<span> around 500 million years ago </span>
Pavel [41]3 years ago
6 0
Scientists think sponges evolved from protists very early in the Cambrian period. In fact, the flagellated collar cells in sponges bear a striking resemblance to the cells in a group of colonial protists. this similarity has led scientists to hypothesize that sponges evolved from such colonial protists. 
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IPSPs are the result of: a. decreasing membrane conductance to potassium neurotransmitter b. binding to ligand-gated ion channel
bearhunter [10]

IPSPs are the result of:

a. decreasing membrane conductance to sodium

b. decreasing membrane conductance to potassium

c. inhibitory neurotransmitter entering the postsynaptic cell

d. neurotransmitter binding to ligand-gated ion channels that are chloride selective

Answer:

d. neurotransmitter binding to ligand-gated ion channels that are chloride selective

Explanation:

IPSP refers to inhibitory postsynaptic potential (IPSP). It occurs when the neurotransmitters released from the axon terminals of the presynaptic neurons bind to and open the chloride ion channels. This allows the entry of chloride ions into the neuron making the inside of the membrane even more negative. This does not allow firing of the action potential. The postsynaptic neuron is said to be hyperpolarized. Therefore, IPSP results from hyperpolarization of postsynaptic neurons by the opening of ion channels such as chloride channels.

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3 years ago
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rusak2 [61]

Answer:

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Explanation:

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How does the size of a eukaryotic organism normally compare to the size of a prokaryotic organism
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3 0
3 years ago
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A tall plant (TT) is crossed with a short plant (tt). What is the genotype?
neonofarm [45]

Answer: TT: 1/4; Tt: 2/4;tt: 1/4

Explanation:

The Punnett square is a diagram that is used in the predictions of genotypes. In this scenario, if we have a tall plant (TT) is crossed with a short plant (tt), after using the Punnett square, the genotype that we will get are as follows:.

TT, Tt, Tt, tt

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