I rly need help fasttt b) Would it be common to find two organisms that had a relationship that could be described as both parasitism and commensalism? (2 points)

7. Look at the energy pyramid below.

a) The size of each level describes how much energy is available at each trophic level. Is this an example of a healthy ecosystem or an ecosystem that may not be able to continue existing? Explain. (3 points)

b)Why are there always fewer secondary consumers in an ecosystem than primary consumers?

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?

The law of states that traits are passed from parents to offspring independently of one another.. true or false