Models are simplified representations of of different complex systems. They also help to study very small or large objects.
Option B, D and E.
Explanation:
Models are very simplified representations of complex systems and organs or structures which are prepared to study those systems by scientists and normal people easily. Many structures of human body like cells or some tissues are very small in structure or microscopic in nature. So studying them are very hard without specific instruments which are not always available. Thus models are made to easily study those structures by scientists and even normal people and students.
If in an eight-cell embryo of an organism, the cells of the upper tier are aligned over the cells of the lower tier at a slight angle, it is likely that the organism is a vertebrate.
<span />
Answer:
Heterotrophs or consumers
Explanation:
This are organisms that cannot produce their own food. They rely on autotrophs ( plants or producers ) for food. Most of the times these are normally animals.
HOPE THIS HELPED
Answer:
d
Explanation:
endocrine system controls all biological processes
