the embryo began as a fertilized egg: 2 individual gametes joined to produce one diploid cell. once the egg is fertilized, what process is responsible for the development of the embryo?

Circulation is maintained in the veins by the

How do scientists know what the surface of venus looks like?

Would competition increase or decrease genetic variation? Or could it both increase and decrease?

After a long soccer practice, Jack felt his pulse increase. As he cooled down, his pulse began to slow. Since he'd been studying the circulatory system in science class, he knew why his pulse slowed.

Which term best describes the study or theoretical explanation of natural phenomena Ecology Biology Science Agriculture

What would happen if grasses and shrubs were removed from an ecosystem? A. the primary consumers would increase B. the primary consumers would become secondary consumers C. the primary consumers would die out or move elsewhere D.

How do scientists control the spread of disease?

What is a tetrad? A. A chromatid before meiosis B. Another term for a sperm cell C. A haploid cell produced by meiosis D. Two sets of sister chromatids

Can an organism choose how to adapt?

what are 4 human activities that interfere with ecosystems, food chains and food webs.