If objects will sink between boundaries with different densities due to gravity, then objects will sink between boundaries with different what due to gravity? Answer choices: - Energy. - surfaces - densities - forces - rocks - minerals - energy - heat energy
densities

If perennial reproduction requires pollination, then what reproduction requires pollination? Answer choices: - humans - They lay eggs - Tropical - bees - insects - subtropical - perennials - heterotrophs
perennials

Q: If insects are arthropods, then what group do insects belong to? Answer choices: - graptolites - animals - annelida - mollusca - chordata - honeybees - arthropods - more abundant
A: arthropods

Question: If fertilization is caused by the usage of gametes, then what causes fertilization? Answer choices: - pollen - infertility - gametes - orchids - seeds - no physical contact - honeybees - isolation
Answer: gametes

*Question*
If hydrogen bonds cause H20 to expand when it freezes, then what causes H20 to expand when frozen? Answer choices: - evaporation - vaporization - hydrogen bonds - helium bonds - mysterious forces - nitrogen bonds - Physical weathering - precipitation
**Answer**
hydrogen bonds

Q: If kinetic energy running through a wire causes that wire to heat up, then _running through a wire causes that wire to heat up? Answer choices: - sunlight - hydrogen and oxygen - activation energy - to move people - an object - rays or beams - kinetic energy - reflecting light
A: kinetic energy