D because it is the correct one
Interactions among organisms and their environment.
Answer: The idea of natural selection is that traits that can be passed down allow organisms to adapt to the environment better than other organisms of the same species.
Answer: C) Does the cell have membrane-bound organelles?
Explanation: eukaryotes have a membrane bound nucleus while prokaryotes don’t.
hopefully it correct! it made more sense to me than the other ones :)
Extension or straightening of the elbow stops when the proximal end of the ulna engages the olecranon fossa of the humerus.
Explanation:
Extension of the elbow is the straightening of the forearm or bringing it back to its anatomical position by the triceps brachii and the anconeus muscles.
The elbow joint, a hinge type of joint, is formed at the conjunction of humeral distal end with the ulnar proximal end.
Olecranon process is a structure at the ulnar distal end which fits exactly into the olecranon process at the humeral proximal head with the arm in extended position.
Olecranon fossa is a <em>triangular</em> depression or fossa which is deep in the posterior humerus. So the range of motion due to extension of forearm terminates or limits at the contact of the ulnar olecranon process with that of the humeral olecranon process at the olecranon fossa.
