Which kingdom is know to contain organisms that have cells with no cell walls

Which factors can have the greatest effect on the health of a river system? A. type of soil and salinity B. nitrate levels and turbidity C. human consumption and pH D. natural disasters and tidal changes

When a two-year-old is admitted to a hospital, why is it important to encourage the parent (s) to bring a familiar object, such as a blanket or favorite toy, with the child?

Of the following, which is best supported to suggest where life is believed to have originated on Earth? Select one: a. RNA world hypothesis b. Primordial soup origin hypothesis c. Subsurface origin hypothesis d. Theory of natural selection

The three-dimensional structure of a protein is determined primarily by: A) electrostatic guidance from nucleic acid structure B) how many amino acids are in the protein C) hydrophobic interaction with lipids that provide a folding framework D)

Genetic variability is the most important result of sexual reproduction or asexual reproduction?

What three components make up a nucleotide? A. a deoxyribose, a phosphate, and an enzyme B. a phosphate, an enzyme, and a nitrogen base C. an enzyme, a deoxyribose, and a nitrogen base D. a phosphate, a deoxyribose, and a nitrogen base

How do ice berg form

Which finding would have disproved Virchow's hypothesis? 1.) Animalcules are not organisms. 2.) Animals are made of non-cell-based matter. 3.) Plants are made of non-cell-based matter. 4.) Cells can generate from nonliving matter.

Which of these events happens during M phase in the cell cycle? O A. The nucleus of a cell divides into two identical nuclei. O B. All of a cell's chromosomes are copied when DNA replicates. . The cell's DNA is checked for errors in replication. O D.

Which phylum includes animals that lack tissues? Cnidaria Porifera Platyhelminthes Arthropoda Chordata