B. skeletal and nervous system
Answer:
Explanation:
I'm not sure what the multiple-choice answers are but knowing that: abiotic factors are non-living chemical and physical parts of the environment that affect living organisms. But if there is any answers related to the cockroaches environment like Temperature and climate those may be the best choices.
The right answer is B.
*Hydrogen is the most abundant element representing nearly three quarters of the mass of the universe.
*Hydrogen is found in the water that covers 70% of the surface of our planet as well as in all organic matter.
*Hydrogen is the simplest element in the universe. It is composed only of one proton (p) and only one electron (e-).
*Hydrogen is the lightest element of all elements and gases; it is 14 times lighter than air. A "spill" of hydrogen gas immediately diffuses into the air and pollutes neither the ground nor the water table.
*Hydrogen is invisible, odorless and nontoxic. It does not cause acid rain, does not deplete the ozone layer and does not generate dangerous emissions.
Answer:
All living things must produce offspring like themselves in order for their species to survive. This is the process known as reproduction. Plants produce seeds that give rise to new plants of the same species. Animals lay eggs or have babies.
Explanation:
Answer:
Option (3).
Explanation:
Bone may be defined as one of the most important connective tissue of the body. The weight of muscles are bear by the bone and bone are interconnected with each other.
Two main types of bone are primary bone and secondary bone. Primary bone is present in the embryonic development whereas this bone is replaced by secondary bone in adults. The primary and secondary bone can not be distinguished on the basis of amount of the inorganic matrix as both has nearly equal amount of organic matrix.
Thus, the correct answer is option (3).