The pictures show two different ferns that lived millions of years apart. The early fern is extinct, but is drawn based on fossil evidence. Scientific data reveals that the early
fern is an ancestor of the modern fern.
Early Fern
Modern Fern
Which statement best explains why the fern changed over time?
O Humans cut ferns to be decorations, causing each generation to be smaller in size.
O As the Sun aged, its energy output decreased and limited the size ferns could grow.
O As flowering plants emerged, less energy was left for ferns and the growth of ferns was stunted.
The changing environment caused unfit plants to die and better adapted plants were smaller in size.

your answer should be c) enjoy!

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle