Why is it so important to time the meeting of the sperm and the egg with great care? A: Higher genetic breeds do not have good sperm.
B: It takes many sperm cells to fertilize an egg.
C: The eggs are only viable for fertilization for 12 hours.
D: The eggs are only viable for fertilization for 24 hours.

Analyze how the four requirements for life were identified by scientists

The diagram shows a model of dna. which part of the dna molecule codes for the amino acid sequence in the protein?

How do energy and matter move through an ecosystem? both energy and matter unidirectionally flow through an ecosystem. both energy and matter cycle within an ecosystem. matter unidirectionally flows through an ecosystem, whereas energy cycles within an ecosystem. energy unidirectionally flows through an ecosystem, whereas matter generally cycles within an ecosystem.