How many variables are changed in a controlled experiment

Carrying a jute bag for shopping (a) Reduce (b) Reuse (c) Recycle

How is energy transferred from the Sun, then cycled through all living organisms in an ecosystem?

Chemical triggers and messengers for many processes within cells that cause most of the differences you can see among organisms are called

Which of the following statements is true? a) When you add heat to a substance, its temperature usually increases. b) When a substance gives off heat, its temperature increases. c) Heat and temperature are the same.

Why would it be beneficial for a young plant to disperse away from its parent?

Which of the following is the densest layer of solid earth? A. Crust B. Atmosphere C. Core D. Mantle

When a cell undergoes mitosis, how many daughter cells are produced? Are they genetically identical or are they different. Why is this important, especially in multicellular organisms?

The structural level of a protein least affected by a disruption in hydrogen bonding is the A. primary level B. secondary level C. tertiary level D. quaternary level

Which of the following statements is true about psychological factors of attraction? A. You are likely to be attracted to someone who is different from you. B. You are likely to be attracted to someone who is physically far away from you. C.

A person that is heterozygous type AB (AB) marries a person that is heterozygous type A (AO). What is the probability that their potential offspring will be type A? A. 0% B. 25% C. 50% D. 75% E. 100%