Answer:The helix structure Of DNA helps prevent it from been expose and also the sugar and phoshate group that are important components of nucleotides forms a backbone on the helix structure or the polynucleotide this back bone is hydrophobic i.e water loving hence wouldn't allow for penetration for water.
2. Hydrogen bond is formed between this bases to keep them in place.
Explanation:
D. Animals release carbon dioxide when they breathe, which plants take in to help make food.
Answer:
Explanation:
Protozoa and helminths are two major groups of organisms acting as parasites and are able to cause various infections to humans. In definition, parasites are the organisms that live in or on other organisms (called host), and are capable of damaging the host. This biological relationship or the phenomenon is known as parasitism
1.lungs
2.minerals
They are the answers you will need hope this helps
<span>B. organ systems, organs, tissues, cells
Organ systems are the most complex in this grouping, they are made up of multiple organs, tissues and cells all working together with other organ systems to keep an organism alive. Examples of organ systems are the digestive system, respiratory system, nervous system. Organs are groups of tissues and cells working together with a main purpose. Examples of organs are heart (pumps blood), brain (controls the body), stomach (digests food). Tissues are groups of cells working together as a whole such as cardiac tissue, adipose tissue and blood. Cells are the smallest unit of life, in groups they form tissues and organs. Cells of the body include neurons, blood cells, skin cells, and fat cells.</span>
