Answer:
Explanation:
Placoderms were the first jawed fish; their jaws likely evolved from the first of their gill arches. in spanish
placodermos
A reflex is involuntary however, other actions are voluntary in nature
A reflex action is an involuntary and almost instantaneous movement in response to a stimulus. It usually does not require any thought or input and therefore does not directly involve the brain.
The path taken by the nerve impulses in a reflex action is called a reflex arc. Most reflex arcs involve three neurons. There are two types of reflex arcs namely autonomic reflex arc which involves the inner organs of the body, and somatic reflex arc, which involves muscles.
Both the plant and the bacteria benefit so the answer is mutualism.
Hope it helped!
Answer: b. is the correct answer opposable
Explanation:
opposable: (of the thumb of a primate) capable of moving toward and touching the other digits on the same hand.
I think the correct answer would be A. The yolk sac becomes the placenta. It is membranous sac that is attached to the embryo. It provides all the nutrition and the blood cells needed by the embryo. It is also called the umbilical vesicle.