Lysosomes break down and recycle worn out cells.
Secondary structures are dependent upon hydrogen bonding. The two main types of secondary structure are the a-helix and the B-sheet. The a-helix is a right-handed coiled strand.
D. 99% of all living things that have ever existed are now extinct
Answer:
Explanation:Explanation: Classification of organisms is a hard task cause many organisms have their differences and similarities, whereby making it very complicated in classifying organisms.. All living organisms are classified into groups based on very basic, shared characteristics
