Select the correct option:(1) Annelids are th | vedclass

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(A) $(1)$ Annelids (phylum Annelida) are indeed the first group of animals in the evolutionary hierarchy to possess a closed circulatory system.$(2)$

Vedclass · Accepted Answer

Both $(1)$ and $(2)$ are correct.

Vedclass · Answer

(A) $(1)$ Annelids (phylum Annelida) are indeed the first group of animals in the evolutionary hierarchy to possess a closed circulatory system.$(2)$ $A$ heart is called myogenic when the heartbeat originates from specialized muscle cells (like the $SA$ node in humans) rather than from nerve impulses. This is true for vertebrates.

Select the correct option:
$(1)$ Annelids are the first animals to possess a circulatory system.
$(2)$ The heart is called myogenic.

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Select the correct option:$(1)$ Annelids are the first animals to possess a circulatory system.$(2)$ The heart is called myogenic.