The explains how wavelengths of light - and sound - change when the source is in motion.
Question 1 options:

Electromagnetic Spectrum

Doppler Effect

Universe

Spectograph

Which of these is the most likely consequence of falling petroleum price

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Parthenogenesis is a type of reproduction that does not require a mate. it’s rarely seen in birds and higher vertebrates. parthenogenesis involves the formation of a zygote. but this zygote is formed without fertilization. in parthenogenesis, in the absence of a male gamete, the ovum develops directly in the zygote.