Which of the following is not true about sedimentary rocks?

a.
they are formed through compaction and cementation.
c.
they are formed from igneous rock fragments.
b.
they are made up of sediments.
d.
they are not part of the rock cycle.

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.