Answer:
Viruses have to invade the body of a host organism in order to replicate their particles. Therefore, most viruses are pathogenic. The main difference between bacteria and virus is that bacteria are living cells, reproducing independently and viruses are nonliving particles, requiring a host cell for their replication.
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The ocean and atmosphere are connected. They work together to move heat and fresh water across the globe.
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Answer: C. They have vascular tissue such as xylem and phloem and reproduce with spores.
Explanation: This is the correct answer for Pennfoster.
Answer:
tissues --> organs --> organ system --> whole organisms
Explanation:
The simplest is tissues, while the most complex is whole organisms.
1) Tissue is an aggregation of cells
2) Organ is composed of tissues that perform similar functions.
3) Organ system refers to a group of organs that work together and coordinated to perform one or more functions. An example is the nervous system.
4) whole organism is a discrete and complete living thing, such as animal. It comprises of tissues, organs, organ systems all working together as a coordinated unit.
