A marine biologist observed an organism. It had openings on its body through which food particles and water passed. Which phylum does the organism belong to?

Cnidaria

Porifera

Platyhelminthes

Which of the following results in the release of nuclear energy? a. Only the breaking of nuclear bonds. b. Only the forming of nuclear bonds. c. Both the breaking of nuclear bonds and the forming of nuclear bonds. d.

Gene expression is often assayed by measuring the level of mrna produced from a gene. what level of the control of gene expression can by analyzed by this type of assay?

Which hormone most affects the osmolarity of blood?

If DNA can be described as the instruction book for building an organism, which phrase best describes a gene? A. A single letter in the instruction book B. A three-letter word in the instruction book C. A sentence in the instruction book D.

Which is an example of a reflex? A. putting on a coat when you see that it is snowing outside B. pulling your foot away after stepping on a sharp object C. laughing at a funny joke told by one of your classmates D.

Which phrase defines a law? a possible explanation or answer to a scientific question that is based on prior knowledge or research and is testable A statement of fact that is generally accepted to be true and universal because it has always been

Which vessels allows for oxygen movement into the tissues

What is the difference between a physical and a chemical change

What is described by binary fission? A) The way prokaryotes move. B) The way prokaryotes produce energy. C) The way prokaryotes reproduce. D) The way prokaryotes digest nutrients.

There are many different ecological and environmental conservation methods. Which is not a conservation method? A) water harvesting B) fishing seasons and limits C) limiting of clear cutting of forests D) wind and wave erosion on coastal areas