When cardiac muscle cells are damaged by a heart attack, they are usually replaced by new cardiac muscle cells. new smooth muscle cells. connective tissue cells. epithelial cells. nerve cells?

The correct answer is the connective tissue cells.

Explanation:

The heart does not possess the tendency to reproduce heart muscle after a heart attack and the lost cardiac muscle gets substituted by the scar tissue. The scar tissue does not donate to the cardiac contractile force and the left viable cardiac muscle is vulnerable to greater hemodynamic burden.  

With time the muscles of the heart ultimately fail to result in the development of heart failure. The scar tissue, as the component of the healing procedure are the unique cells known as the fibroblasts. They are the fibrous connective tissue formed of collagen.  

format change of dna.  

spiders belong to a group of arachnids.

arachnids have the following traits :

they have two body parts.

they have eight legs unlike insects which have 6 legs.

they have no wings.

these traits distinguish them from insects.

the information that antonio is doubting us the statement that spiders differences are as a result of being first to evolve.

this is because the evolution of one species is independent of the other species.