The image shows a week-old chick embryo. What can you conclude about its current stage of development? Help me please, it’s multiple choices

This is a new idea, more effective device or process. this an be viewed as the application of better solutions that meet new requirements, inarticulated needs, or existing market needs. what's the term?

Which term describes the number of waves that pass a given point in a given time? crest frequency trough wavelength

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria