Unlike identical twins, fraternal twins

A. are always the same sex

B. are produced from two identical embryos

C. result from two eggs fertilized by two different sperms.

D. is wrong

Processes such as changes in orbital geometry or volcanic eruptions have clearly affected climate in the past, and these explain the dramatic warming of the last 200 years. True or false

What is the sarcoplasmic reticulum? how does it aid in the stimulation of muscle contraction?

Summarize how a dichotomous key works

The hallmark manifestations of Cushing syndrome are a moon face, a "buffalo hump" between the shoulder blades, and a protruding abdomen. What other manifestations of Cushing syndrome occur?

Are all organisms with similar physical characteristics related to one another? If not, why?

Horses and donkeys can breed and produce sterile offspring known as mules. Horses and donkeys remain separate species because of this hybrid sterility, which is: 1. an allopatric barrier to reproduction. 2. a postzygotic barrier to reproduction. 3.

A group of cells working together is known as what

What do amoeba proteus, dinoflagellate, and euglena viridis have in common? a. they all can move and make their own food b. they all can move and use eye spot to locate food c. they all can move and be heterotrophic d.

How is a scientific hypothesis best evaluated?

The overall population of a species decreased. What could have occurred to make this happen? The immigration rate increased, while the death rate decreased. The birth rate decreased, while the death rate increased.