The definition to parasitism is "the practice of living as a parasite in or on another organism." (Wikipedia). Therfore the answer to this is Ticks live on and drink blood from a cow, because this is the only option where an organism is living directly off another organism.
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D. Organisms only need water
Answer:
embryo sac, embryo, zygote.
Explanation:
A secondary source is anything written after the fact
Answer:
Life Cycle of Viruses with Animal Hosts Lytic animal viruses follow similar infection stages to bacteriophages: attachment, penetration, biosynthesis, maturation, and release (see Figure 4). However, the mechanisms of penetration, nucleic-acid biosynthesis, and release differ between bacterial and animal viruses.
Explanation: