How are elements that are heavier than hydrogen spread throughout the universe? a. when a star collapses into a neutron star b. when a star forms into a red giant c. when a star collapses as a black hole d. when a star explodes as a supernova

D

Explanation:

Supernovae are an explosion of stars, during star death. During the life cycle of a star, it gravitation pull of its core squeezes lighter atoms such as hydrogen into heavier atoms like helium and carbon. When the stars explode in a supernova, these elements are jettisoned out forcefully into outer space even up to speeds of 25,000 miles/second.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.