What features signifies to astronomers that a distant star is part of a planetary system

A) the star periodically dims

B) the star expands into a red giant

C) the star moves through the sky

D) the star continuously gets brighter

Cells can continue to grow bigger and bigger with no limit to their size. True False

While breathing into a plastic bag what happens to the levels of carbon dioxide in your blood?

Which of the following processes contribute to antibody diversity? a. Accelerated random mutation b. Imprecise joining events of V, D, and J regions c. Somatic recombination d. Junctional diversity e. All of the above

9. How do haploid (n) cells form?

Severe genital itching caused by parasites is a common symptom of which sti?

Explain why a mark on a blade of grass will move away from the ground as the grass blade grows

What do enzymes react with? A. the products of chemical reactions B. the active site of the plasma membrane C. proteins in the cytoplasm D. a specific substrate

Isaac watched a movie where a tsunami washed across the coastline. He related the incident to the geology of the ocean he learned at the school. Which geological phenomenon did Isaac relate to? A. plate tectonics B. upwelling C.

How do mutations affect an organism? A. they may cause the development of a disease-causing allele B. they may cause the development of a more beneficial allele C. they, in some cases, may have no noticeable affect D. all of the above

Scientists make two types of observations that can be either