Answer:
D. organ systems
Explanation:
Organs and tissues that perform the same function are called organ systems
All organisms are made of cells
all existing cells are produced by other living cells
the cell is the most basic unit of life
Answer:
lack of resources, and mating
Explanation:
they may go ictenct
This question is unfortunately incomplete. However, the general skull features of <em>H</em><span><em>omo heidelbergensis </em></span>include large brow ridges, a broad, sloping forehead and a rear skull wall that is vertical rather than rounded or sloping.
Why are ecosystems with grass better for herbivores than ecosystems with trees?
Trees cannot store a lot of energy in the leaves, so grass would be better.