Choose the statements below that most accurately describe sipunculans. Select all that apply. Check All That Apply a. Membership in this group is somewhat limited at fewer than 300 known species.
b. Most sipunculans are benthic living in mud or sand burrows.
c. Because sipunculans are aquatic and mostly microscopic they do not need excretory organs to manage waste.
d. Sipuncula species develop gonads seasonally and most are dioecious.

Which best describes meiosis? a. it produces cells that are identical to the original cell b. it is responsible for the replacement of damaged skin cells c. it is responsible for growth of the organism d. it produces male and female sex cells

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?

Agroup of students are walking in the park and one of them takes a picture of a pollen grain that is been blown by the wind what caption can the student use for this picture