Maureen sprinkled some seeds on the ground in the woods near her home. A few weeks later, she returned to the place where she sprinkled the seeds. She noticed that some seeds germinated and some did not. The seeds that had thick layers of branches and leaves overhead did not germinate. The seeds that were below clear areas of the forest did germinate.
Which condition is probably very important for the germination of these types of seeds?
A. oxygen
B. soil type
C. sunlight
D. food

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

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

Spirochetes have a twisting and flexing locomotion due to appendages called