Whats a pure substance that cant be broken down into simpler substances by chemical or physical means

1. An animal that has body parts that extend outward from its center shows A) radial symmetry. B) segmentation. C) several planes of symmetry. D) bilateral symmetry. 2. A coelom is a body cavity A) completely lined with mesoderm.

Animal-like protists, such as Amoeba and Paramecium.

Suzy knows that an individual's sex is determined by sex chromosomes. She knows that females have two X chromosomes and males have one X and one Y chromosome. She creates the Punnett square cross below to show sex inheritance.

Whose job is it to release the carbon that remains in the bodies of dead organisms? A producers B carnivores C herbivores D decomposers

A new multicellular organism has been discovered, and scientists want to study the organism's cell structures, including organelles. Which microscope should they use?

During upwelling, nutrient-rich water rises to the surface. How would this most likely affect the biotic components of the ecosystems where the upwelling is taking place?

Determine whether each activity impacts land resources in a positive or negative way. Drag each term to the correct category.

1. List 2 examples of positive feedback loop in you body 2. List 2 examples of negative feedback loop in your body

Which of the following genotypes is homozygous recessive? A.) ss B.) Bb C.) TT D.) XY

If each normal body cell of a human contains forty-six chromosomes, then the number of chromosomes in a human egg will be